Nano-Structures & Nano-Objects最新文献

{"title":"Synthesized graphene-silicon oxides hybrid nanocomposite using laser ablation for optoelectronic and antibacterial activity","authors":"Khansaa Haleem Mohsin ,&nbsp;Ehssan Al-Bermany ,&nbsp;Siti Azrah Mohamad Samsuri ,&nbsp;Ahmed M. Amshawee ,&nbsp;Naser M. Ahmed","doi":"10.1016/j.nanoso.2026.101695","DOIUrl":"10.1016/j.nanoso.2026.101695","url":null,"abstract":"<div><div>Green methods for synthesizing nanocomposites revealed unique properties, making them versatile for multi-biophysical applications. Pulsed laser ablation (PLAL), using a pulsed Q-Switched CO₂ laser to synthesize graphene oxide-silicon dioxide (GO@SiO₂) with an energy of 250 mJ and 10.6 μm wavelength. Three different times (1, 2.5, and 5) minutes were applied for each pulse. Fourier-transform infrared spectroscopy revealed a strong bond between the GO and SiO₂ nanomaterials. Field-emission scanning electron microscopy and energy-dispersive X-ray Spectroscopy confirmed that increasing the pulse time increased the element content. The Raman spectra confirm the successful formation of GO@SiO₂ nanocomposites, preserving the graphitic structure (D and G bands) alongside the characteristic Si–O–Si vibrational modes. Increasing PLAL ablation time enhances peak intensity and improves interfacial interaction between GO and silica. Dynamic light scattering revealed the size of the nanoparticles and demonstrated the presence of a monolayer and a few GO layers in the SiO₂ nanoparticle system. Based on its optical properties, GO@SiO₂ exhibits an absorption peak between 200 and 280 nm. The energy bandgap decreased from 4.7 eV to 4.28 eV and from 4.2 eV to 3.8 eV for the allowed and forbidden transitions, respectively. It was observed that as the concentration of synthesized GO nanosheets was increased, the inhibition zones of <em>E. coli and S. aureus</em> increased from 06 mm to 20 mm and from 21 mm, respectively. GO@SiO₂ nanoparticles exhibit a significant cytotoxic effect against HT-29 colon cancer cells. The syntheses of GO demonstrated promising properties for optoelectronic devices and biological applications.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101695"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148184108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biomass-derived activated carbon supported silver nanoparticles for water disinfection: A comprehensive review","authors":"Belete Tessema,&nbsp;Getahun Tefera,&nbsp;Glen Bright","doi":"10.1016/j.nanoso.2026.101689","DOIUrl":"10.1016/j.nanoso.2026.101689","url":null,"abstract":"<div><div>This comprehensive review explores biomass-derived activated carbon supported silver nanoparticles (AgNPs) as a sustainable solution for water disinfection. Water contamination from pathogens, organic pollutants, and heavy metals poses significant health risks globally, emphasizing the need for effective, affordable treatment technologies. AgNPs exhibit potent antimicrobial properties, especially at the nanoscale, but face challenges such as stability, environmental toxicity, and leaching. Supporting AgNPs on biomass-derived activated carbon—obtained from agricultural waste, forestry residues, and other biomass sources—enhances stability, dispersibility, and reusability while aligning with green chemistry principles. The synthesis methods, including chemical reduction and green approaches, produce uniform, well-dispersed nanoparticles anchored onto porous carbon supports, resulting in efficient microbial inactivation through mechanisms like silver ion release, reactive oxygen species generation, and membrane disruption. The porous structure facilitates pollutant adsorption, concentrating microbes near active silver sites. Laboratory studies demonstrate rapid bactericidal and virucidal effects, high reusability, and minimal silver leaching. However, challenges such as scaling synthesis, long-term stability, and environmental safety remain. Future directions involve optimizing immobilization techniques, developing eco-friendly synthesis routes, and integrating these nanocomposites into multifunctional water treatment systems. Biomass-supported AgNPs hold promise for sustainable, cost-effective, and efficient water sanitation, especially in resource-limited settings, contributing to global health and environmental sustainability.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101689"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147951159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Co-precipitated engineered nanocrystalline magnesium oxide: Structural symmetry and thermal behavior analysis insights","authors":"Fariha Zannat ,&nbsp;Mohshin Maola ,&nbsp;Md. Ashraful Alam ,&nbsp;Debasish Sarkar ,&nbsp;Raton Kumar Bishwas ,&nbsp;Subarna Sandhani Dey ,&nbsp;Shirin Akter Jahan","doi":"10.1016/j.nanoso.2026.101702","DOIUrl":"10.1016/j.nanoso.2026.101702","url":null,"abstract":"<div><div>Highly crystalline magnesium oxide nanoparticles (MgO NPs) with a pronounced preferential orientation along the (2 0 0) plane were synthesized by a simple co-precipitation route. The X-ray diffraction and Rietveld refinement confirmed the formation of phase-pure cubic MgO (99.20 %) with a lattice parameter of 4.2158 Å and an average crystallite size of 29.35 nm. The NPs exhibited a wide optical band gap of 5.90 eV and a high specific surface area of 60.96 m² g⁻¹ . Thermal analysis demonstrated good stability, with an activation energy of 32.25 kJ mol⁻¹ and an exothermic crystallization event at 511.3–520.5 °C (ΔH= 5.843 J g⁻¹), indicating the transformation of residual amorphous domains into crystalline MgO. Transmission electron microscopy (TEM) revealed predominantly spheroidal particles with a mean size of 33.95 nm, while HR-TEM showed an interplanar spacing of 0.2103 nm, corresponding to the dominant (2 0 0) plane without a defect. The synthesized MgO NPs showed broad-spectrum antimicrobial activity against Gram-positive and Gram-negative bacteria and fungal strains. These results demonstrate that the combination of nanoscale dimensions, high phase purity MgO NPs with multifunctional properties, makes them promising candidates for antimicrobial ceramic coatings technologies.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101702"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148184110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response surface optimization of fluoride sequestration using L-lysine stabilized mesoporous silica xerogel","authors":"Atul Srivastava ,&nbsp;Anushree Srivastava","doi":"10.1016/j.nanoso.2026.101685","DOIUrl":"10.1016/j.nanoso.2026.101685","url":null,"abstract":"<div><div>This study evaluates the fluoride removal efficiency of <span>L</span>-lysine functionalized silica xerogel and optimizes the adsorption process using response surface methodology. SEM and EDX studies revealed an irregular porous morphology with elemental composition, while XRD confirmed the predominantly amorphous silica framework. FTIR indicated characteristic Si–O–Si and –NH functional groups. BET analysis showed a high specific surface area of 245.16 m² g⁻¹ , and XPS confirmed siloxane (Si–O–Si) linkages (Si 2p at 103.4 eV) along with nitrogen-containing functionalities. Batch adsorption experiments assessed the effects of pH, initial fluoride concentration, adsorbent dosage, contact time, and temperature. The equilibrium data followed the Langmuir isotherm, indicating monolayer adsorption, while kinetics were best described by the pseudo-second-order model, suggesting chemisorption. Thermodynamic parameters confirmed that the adsorption process was spontaneous and endothermic. A central composite design generated a statistically significant quadratic model (p &lt; 0.0001), identifying pH and initial fluoride concentration as the most influential factors. Under optimized conditions of pH 6.6, fluoride concentration 14.4 mg/L, adsorbent dosage 3.0 g/L, contact time 164 min, and temperature 31.35 °C, a maximum removal efficiency of 99.52% was predicted and experimentally validated. These results demonstrate the potential applicability of the functionalized silica xerogel for effective fluoride removal from contaminated water.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101685"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147951160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facile co-precipitation synthesis of bismuth ferrite (Bi₂Fe₄O₉) nanoparticles: Structural, morphological, optical, and photocatalytic characterization","authors":"Ahmed M. Ajam,&nbsp;Khalid Haneen Abass","doi":"10.1016/j.nanoso.2026.101666","DOIUrl":"10.1016/j.nanoso.2026.101666","url":null,"abstract":"<div><div>The wide range of Bismuth compounds offers various applications, whereas bismuth ferrite is one of the suitable compounds for photocatalytic applications. In this paper, a successful preparation of bismuth ferrite (Bi₂Fe₄O₉) by a simple and low-cost co-precipitation method is presented, aiming to develop a photocatalyst for the treatment of organic pollutants. The structural, morphological, and optical properties of the sample were analyzed using XRD, SEM, and FTIR techniques. XRD results showed the formation of a pure crystalline phase with a highly regular mullite structure and nanocrystals with an average size of 30 nm, while SEM images revealed interconnected quasi-spherical particles that enhance charge transport. Spectral analyses confirmed the presence of characteristic peaks of Fe–O and Bi–O bonds within the structure, in addition to active surface –OH groups that contribute to the generation of hydroxyl radicals. The optical absorption spectrum showed an energy gap of 2.3 eV, suggesting potential responsiveness to both ultraviolet and visible regions. In photocatalytic tests, the catalyst achieved approximately 12% degradation of methylene blue dye within 150 min under UV irradiation, with an apparent pseudo-first-order rate constant of 4.0 × 10⁻⁴ min⁻¹ and a regression coefficient of R² = 0.9267, outperforming direct photodegradation. Comparative analysis with literature reports indicates that higher efficiencies (up to 80–99%) and faster kinetics have been achieved in optimized Bi₂Fe₄O₉ systems, where rate constants typically fall within the range of 10⁻³ to 10⁻² min⁻¹ . The reaction followed apparent first-order kinetics, indicating a surface-controlled mechanism. The results indicate that Bi₂Fe₄O₉ possesses suitable structural and electronic properties for photocatalytic applications; however, its activity under the present conditions remains limited, highlighting the need for further optimization. This could be achieved through strategies such as heterostructure formation or controlled doping to enhance charge separation and extend light absorption toward the visible region</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101666"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147798012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Functional impacts of carbon-based nanomaterials in the performance of heterostructure photocatalysts for the remediation of pharmaceutical pollutants in wastewater- A review","authors":"Joshua A. Oyetade ,&nbsp;Opeyemi A. Iresemowo ,&nbsp;Mariam I. Adeoba ,&nbsp;Omolola E. Fayemi ,&nbsp;Sunday F. Abimbade ,&nbsp;Adeyemi O. Adeeyo","doi":"10.1016/j.nanoso.2026.101675","DOIUrl":"10.1016/j.nanoso.2026.101675","url":null,"abstract":"<div><div>The toxicity, persistence, and recalcitrance of pharmaceutically active compounds (PhACs) in wastewater to conventional treatment methods are attributable to their chemical stability, low biodegradability, and structural complexity. However, studies have identified photocatalytic treatment in advanced oxidation processes (AOPs) as a panacea for these targeted pollutants. The review evaluates the unique dimensions of carbon-based nanomaterials (CBNMs) coupled with metals, metal oxides and metal-organic frameworks to form heterostructure photocatalysts. It assessed their functional role in the hybrid photocatalysts. The findings revealed that CBNMs act as electron sinks to capture photogenerated excitons (e^--h⁺). This is due to their π−conjugation and lower bandgap properties, which significantly improve the redox processes during photocatalytic degradation of pollutants in wastewater. Also, the study revealed that various structural dimensions of CBNMs coupled with semiconductors act as electron mediators, inducing accelerated charge transfer and a unique shift of absorption edge to higher wavelength for rapid visible photon absorption. The study specifically presents 2D reduced graphene oxide and 1D carbon nanotubes (CNTs) with bandgap narrowing potentials, structural stability and superior electron delocalization among other CBNMs applied in heterostructure development. Also, the use of a heteroatom doping strategy refines the electronic structure of CBNMs, which creates the premise for prolonged photoinduced carrier lifetime. In addition, a desired charge carrier mechanism of Z-Scheme and the recent S-scheme was accomplished with the formed heterostructure, with photodegradation performance of over 95%. This presents a suitable pathway for advanced treatment techniques for the recalcitrant pharmaceutical pollutants in wastewater.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101675"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147849700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative technologies for solar energy conversion: A review of emerging materials and their efficiency trends","authors":"Fawad Ahmad ,&nbsp;Esha Malik ,&nbsp;Syeda Sadaf Batool ,&nbsp;Shajia Rehman ,&nbsp;Nishat Fatima ,&nbsp;Muhammad Imran Khan ,&nbsp;Suchandra Bhattacharjee ,&nbsp;Mudassar Maraj","doi":"10.1016/j.nanoso.2026.101663","DOIUrl":"10.1016/j.nanoso.2026.101663","url":null,"abstract":"<div><div>Research into new solar energy conversion technologies has increased due to the growing requirement for environmentally friendly and sustainable energy sources. The past few years have seen new photovoltaic materials which include perovskite solar cells (efficiency 26–27%), tandem solar cells (&gt;33%), multi-junction solar cells, organic photovoltaics (19%), dye-sensitized solar cells (14%), quantum dot solar cells (18%), and innovative solar windows which have achieved substantial advances in their ability to transform solar energy into electricity. Next-generation solar cell technologies offer multiple benefits through their flexible design, which enables easy transportation because they can be used in building-integrated solar panels and handheld electronic devices. The review presents a comprehensive assessment of current developments in new solar power technologies, which investigate efficiency improvements and stability issues, and environmental impacts, together with their potential for commercial viability… In addition, lifecycle assessment, circular economy strategies, and machine learning approaches for material optimization are also discussed. Finally, key challenges, future research directions, and a potential roadmap for large-scale development of emerging photovoltaic technologies are highlighted.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101663"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147849705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrafast microwave synthesis of highly luminescent carbon quantum dots: Photoluminescence properties and fluorescence sensing of tetracycline","authors":"Rojin Shahriari,&nbsp;Hossein Amani,&nbsp;Arsalan Gholipour","doi":"10.1016/j.nanoso.2026.101667","DOIUrl":"10.1016/j.nanoso.2026.101667","url":null,"abstract":"<div><div>In this research, carbon quantum dots (CDs) with a quantum yield (QY) of 31% were obtained by citric acid and urea via a one-step microwave irradiation process without the need for any supplementary agents. The as-synthesized samples were nano-sized (≈ 4 nm) and had excellent solubility in water, various functional groups, great resilience to environmental factors, and superb optical characteristics. Moreover, various properties of as-prepared CDs, such as morphology, chemical compositions, and graphitic nature, were explained by different analyses, including High transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and X-ray Diffraction (XRD), respectively. In addition, the as-prepared CDs emitted strong blue fluorescence (FL) at 425 nm when excited by ultraviolet light irradiation (UV) at 360 nm. The findings demonstrated that as-synthesized CDs may be utilized as a sensitive and specific FL indicator for the optical identification of Tetracycline (TC) across a broad spectrum of concentrations ranging from 0 to 400 µM. Impressively, the limit of detection (LOD) was determined to be 1.5 µM based on the quenching of the native FL of CDs. Also, the newly synthesized CDs would serve as a great optical indicator for the identification of TC in various real systems.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101667"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147849706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of aggregate radii, fractal index and extreme packing fraction of the clustered nanoparticle in nanofluid flow: Taguchi and Hermite wavelet-based collocation approach","authors":"K. Karthik ,&nbsp;Vishwanatha R. Banakar ,&nbsp;P. Siva Kota Reddy ,&nbsp;R.J. Punith Gowda","doi":"10.1016/j.nanoso.2026.101680","DOIUrl":"10.1016/j.nanoso.2026.101680","url":null,"abstract":"<div><div>Nanofluids have received considerable attention to enhance heat transfer in rotating and stretching flow systems, and existing literature has investigated the impact of several factors on flow and thermal characteristics. However, most of the current research assumes evenly dispersed nanoparticles and neglects realistic aggregation effects, despite empirical evidence showing that aggregation significantly affects thermophysical properties. Additionally, the role of aggregation properties in nanofluid flow over a revolving cylinder with torsional motion has not been thoroughly examined. Motivated by this research gap, the present investigation examines nanofluid flow with nanoparticle aggregation over a stretching-rotating cylinder subjected to torsional motion in the presence of chemical reactions and thermal radiation. Additionally, the research incorporates aggregation-dependent thermophysical models into the governing equations and compares aggregated and non-aggregated nanofluid behaviour in a unified framework. The resulting nonlinear equations are transformed into ordinary differential equations (ODEs) and solved using the Hermite Wavelet-based collocation method (HWBCM), and the result is validated against the Runge-Kutta-Fehlberg fourth-fifth order (RKF-45) method. A Taguchi optimization analysis is then applied to identify the key parameters impacting heat transfer performance. The results reveal that nanoparticle aggregation enhances heat transfer by modifying velocity, temperature, and concentration boundary layers. Elevating the Reynolds number diminishes the velocity and temperature fields, while thermal radiation enhances the temperature distribution, and higher chemical reactions reduce nanoparticle concentrations. These findings offer helpful insight into developing efficient thermal systems with rotational cylindrical components, such as heat exchangers, rotating cooling devices, and chemical processing machinery.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101680"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147850281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UV-excited pink emissive carbon dots for fluorescent detection of ascorbic acid with additional anti-counterfeiting applications","authors":"Reshmi Madhukumar Nair ,&nbsp;Moisés Armides Franco Molina ,&nbsp;Dariush Ebrahimibagha ,&nbsp;Nayeli Pineda Aguilar ,&nbsp;Jesús Alberto Gómez Treviño ,&nbsp;Soorya Pushpan ,&nbsp;J.A. Hernández-Magallane ,&nbsp;Gloria Lourdes Dimas Rivera ,&nbsp;K.C. Sanal","doi":"10.1016/j.nanoso.2026.101710","DOIUrl":"10.1016/j.nanoso.2026.101710","url":null,"abstract":"<div><div>Metal-free carbon dots that exhibit a unique pink fluorescence under UV-excitation were synthesized from biomass source through a green one-pot hydrothermal method using ethanol-oleic acid medium for the first time. The resulting carbon dots were spherical in shape with an average particle size of 2.7 ± 0.43 nm and exhibited excitation dependent fluorescence with a quantum yield of 7.5%. The spectroscopic analysis revealed the existence of two emission bands, a dominant emission band around near UV/blue region and a secondary emission band around red/NIR region. The coexistence of these emissive states produces a combined spectral output perceived as a pink fluorescence under UV illumination, which is a unique optical behaviour for biomass-derived carbon dots. Notably, this NIR emission is achieved without any post-synthetic modification or metal atom doping and indicates the intrinsic surface states generated during carbonization of the precursor. By utilizing these optical properties, the Cdots were used as a fluorescent sensor for the detection of vitamin C with limit of detection (LOD) of 6.2 µM and successfully validated the practical applicability using lemon juice. Furthermore, these unique UV-responsive pink fluorescence enabled the formulation of an invisible ink capable of generating concealed patterns for optical encryption applications such as anticounterfeiting.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"46 ","pages":"Article 101710"},"PeriodicalIF":5.45,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148183985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}