Bo Ling, Yaguang Wang, Huaze Dong, Hongqi Chen, Lun Wang
{"title":"Enzyme-triggered aggregation of upconversion nanoparticles for targeted photodynamic therapy <i>via</i> NIR irradiation.","authors":"Bo Ling, Yaguang Wang, Huaze Dong, Hongqi Chen, Lun Wang","doi":"10.1039/d4na01050g","DOIUrl":"https://doi.org/10.1039/d4na01050g","url":null,"abstract":"<p><p>A core-shell-shell nanoplatform responsive to alkaline phosphatase (ALP) was developed for efficient tumor targeting and near-infrared (NIR)-activated photodynamic therapy (PDT). Specifically, UCNP@SiO<sub>2</sub>-Bodipy@FFYp was synthesized by encapsulating upconversion nanoparticles (UCNPs) within a silica shell, embedding bodipy derivatives as photosensitizers, and covalently attaching a phosphorylated peptide (FFYp). Förster resonance energy transfer (FRET) from the UCNP emission at 550 nm to bodipy facilitated reactive oxygen species (ROS) generation upon NIR excitation. In the tumor microenvironment, ALP-triggered dephosphorylation converted UCNP@SiO<sub>2</sub>-Bodipy@FFYp into the more hydrophobic UCNP@SiO<sub>2</sub>-Bodipy@FFY, thereby promoting tumor cell uptake and tumor-specific accumulation. By leveraging this ALP-responsive targeting strategy alongside the deep-tissue penetration of NIR light, significant tumor growth inhibition was achieved both <i>in vitro</i> and <i>in vivo</i>. Notably, after 15 days of treatment in Balb/c mice bearing HeLa tumors, the tumor volume was reduced by over 95%. Taken together, these results highlight the promise of UCNP@SiO<sub>2</sub>-Bodipy@FFYp as a tumor-responsive nanoplatform for highly effective, targeted PDT in cancer therapy.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11974261/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143811915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jonathan Trach, Shawna Williams, Brendan Michalczyk, Cole Butler, Alkiviathes Meldrum, John Washington, Jonathan G C Veinot
{"title":"Sonochemically activated room temperature hydrosilylation of silicon nanoparticles.","authors":"Jonathan Trach, Shawna Williams, Brendan Michalczyk, Cole Butler, Alkiviathes Meldrum, John Washington, Jonathan G C Veinot","doi":"10.1039/d4na01067a","DOIUrl":"10.1039/d4na01067a","url":null,"abstract":"<p><p>Hydrosilylation of terminal alkenes and alkynes on the surfaces of hydrogen-terminated silicon nanoparticles (H-SiNPs) has provided a convenient approach toward tailoring surface chemistry. These reactions have traditionally required thermal, photochemical, or chemical activation and are not necessarily compatible with all substrates and particle sizes. Herein, we demonstrate that hydrosilylation on silicon nanoparticles (Si NPs) can be promoted at room temperature by exposing the reaction mixture to a standard ultrasonic bath. This new approach provides surface coverages approaching 30% after 24 h. Introduction of traditional radical initiators to the reaction mixture followed by sonication reduced the reaction time by approximately 4-fold. The Si NPs functionalized using the presented sonochemical methods were compared with equivalent systems modified using conventional thermally- and radically-induced procedures and retain their appealing photoluminescent properties and were found to have slightly lower (<i>i.e.</i>, 27 <i>vs.</i> 33%), albeit comparable degrees of functionalization.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969236/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143795882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sourabh Gouraha, Khalid Bin Masood, Sadaf Jamal Gilani, Apoorva Rai, H S Tewari, Jai Singh
{"title":"Enhanced photoluminescence and photocatalytic properties in Dy-doped sodium zinc molybdate synthesized <i>via</i> a green microwave-assisted method.","authors":"Sourabh Gouraha, Khalid Bin Masood, Sadaf Jamal Gilani, Apoorva Rai, H S Tewari, Jai Singh","doi":"10.1039/d5na00047e","DOIUrl":"10.1039/d5na00047e","url":null,"abstract":"<p><p>This study focuses on the structural, photoluminescence and photocatalytic properties of a Dy<sup>3+</sup>-doped sodium zinc molybdate phosphor. The samples were synthesized using a green microwave-assisted method owing to its efficiency in time and energy consumption. The powder X-ray diffraction (P-XRD) analysis confirmed the monoclinic structure of as-synthesized Dy<sup>3+</sup>-doped sodium zinc molybdate with space group <i>C</i>2/<i>m</i>. The most prominent excitation band appeared at 348 nm under 590 nm, and the emission spectra for all samples exhibited a sharp peak at around 590 nm, which is attributed to the <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>13/2</sub> electric dipole transition of Dy<sup>3+</sup> ions. The emission intensity increases with higher Dy<sup>3+</sup> doping levels, reaching maximum intensity at a concentration of 6 mol% of Dy<sup>3+</sup> in sodium zinc molybdate. Additionally, the Commission Internationale de l'Éclairage (CIE) chromaticity coordinates of the Dy<sup>3+</sup> sodium zinc molybdate phosphor places it within the orangish region. Dy<sup>3+</sup> is also found to play a great role in enhancing the photocatalytic activity of sodium zinc molybdate under UV light. These findings indicate that the as-synthesized phosphor holds promise for white LED and water purification applications.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969378/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143795854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The role of focused laser plasmonics in shaping SERS spectra of molecules on nanostructured surfaces.","authors":"Fran Nekvapil, Cosmin Farcău","doi":"10.1039/d4na00982g","DOIUrl":"10.1039/d4na00982g","url":null,"abstract":"<p><p>Over fifty years have passed since the groundbreaking discovery of Surface Enhanced Raman Scattering (SERS), yet many aspects of this phenomenon remain elusive. In this study, we unveil novel observations concerning the spatial variation of SERS signal profiles through vertical (<i>Z</i> axis) scans, performed by varying the distance between the laser focus and a solid, planar, nanostructured SERS substrate. The signal strength profile manifests a Lorentzian shape during axial scans along the <i>Z</i> direction, consistently peaking above the actual sample surface. More intriguingly, the intensity ratio of various spectral regions-including SERS bands and background-exhibits significant non-constancy along the <i>Z</i> axis. Finite-Difference Time-Domain (FDTD) simulations suggest that these variations can be attributed to specific plasmonic near-field responses induced by the focused/defocused beam at the SERS substrate. This research highlights the critical need to consider that focus imprecision can alter spectral profiles in SERS analyses on solid nanostructured SERS substrates, particularly when devising quantitative assays based on band intensity ratios.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11967353/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143795889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thi Viet Ha Luu, Ngoc Nhiem Dao, Van Vinh Nguyen, Quang Bac Nguyen, Thi Ha Chi Nguyen, Ngoc Chuc Pham, Ngoc Hoanh Dao, Trung Kien Nguyen
{"title":"Microwave-assisted synthesis of self-assembled C-doped-ZnO/g-C<sub>3</sub>N<sub>4</sub> heterojunction catalysts for effective photodegradation of ofloxacin antibiotic.","authors":"Thi Viet Ha Luu, Ngoc Nhiem Dao, Van Vinh Nguyen, Quang Bac Nguyen, Thi Ha Chi Nguyen, Ngoc Chuc Pham, Ngoc Hoanh Dao, Trung Kien Nguyen","doi":"10.1039/d5na00060b","DOIUrl":"10.1039/d5na00060b","url":null,"abstract":"<p><p>In this study, carbon-doped zinc oxide (CZ45) prepared using the microwave-assisted solvothermal method was electrostatically assembled with graphitic carbon nitride (GCN) to obtain CZ45/GCN (CZCN) heterojunction photocatalysts. The obtained composites showed average sizes in the range of 19.12-20.51 nm with the disintegration of petal-like stacked GCN sheets. A significant decrease in the bandgap (<i>E</i> <sub>g</sub>) from 3.12 eV in CZ45 to 2.67-2.81 eV in the CZCN composites and the photoluminescence (PL) spectra indicated an enhanced charge carrier separation suitable for the catalytic application under visible light irradiation. The CZCN11 composite (<i>E</i> <sub>g</sub> = 2.81 eV) with a CZ45 : GCN weight ratio of 1 : 1 demonstrated outstanding photocatalytic performance in the degradation of ofloxacin (OFL) antibiotics compared to the other prepared CZCN composites as well as GCN and CZ45. The optimal parameters for OFL photodegradation by CZCN11 were determined; the CZCN11 dosage, OFL initial concentration, and pH range were found to be 1.01 g L<sup>-1</sup>, 20 ppm, and 7.0-8.0, respectively. Under these conditions, about 96% of the initial amount of OFL was decomposed at an apparent rate of 0.0173 min<sup>-1</sup> in 180 min. A reusability test indicated the excellent durability and recyclability of CZCN11 in OFL photodegradation since the degradation efficiency was reduced only by about 1% after five successive runs without any alteration in the original structure of the composite. Furthermore, the active-charge-trapping experiments displayed the crucial role of superoxide (˙O<sub>2</sub> <sup>-</sup>) radicals in OFL photodegradation by the CZCN composites.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11956032/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143764468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Farhana Azmi, Xiaoxue Xu, Hien Duong, Ping Ye, Titi Chen, Hongxi Li, Jianwei Chen, Sara Madadi Ardekani, Alireza Dehghani, Guoping Zheng, David Harris, Hongxu Lu, Yiping Wang, Qi Cao
{"title":"Renal clearable sucrose carbon dots for doxorubicin delivery to treat renal carcinoma.","authors":"Farhana Azmi, Xiaoxue Xu, Hien Duong, Ping Ye, Titi Chen, Hongxi Li, Jianwei Chen, Sara Madadi Ardekani, Alireza Dehghani, Guoping Zheng, David Harris, Hongxu Lu, Yiping Wang, Qi Cao","doi":"10.1039/d4na01082e","DOIUrl":"10.1039/d4na01082e","url":null,"abstract":"<p><p>Renal Cell Carcinoma (RCC) poses challenges for conventional treatment methods, but recent advancements indicate the potential of nanoparticles (NPs) in enhancing chemotherapy efficacy. This study focuses on developing non-toxic NPs from sucrose and l-serine <i>via</i> hydrothermal synthesis to produce Sucrose Carbon Dots (Suc CDs), designed for renal clearance to deliver hydrophilic drugs for the treatment of RCC. Suc CDs with a size of 4 nm exhibit high fluorescence with a fluorescence quantum yield of 58% and high drug loading capacity without toxicity to normal cell lines (renal tubular cells). Under <i>in vitro</i> conditions, Suc CDs alone are non-toxic, while Suc CDs with DOX display improved anticancer effects on Renca cells (cancer cell line). Under <i>in vivo</i> conditions, Suc CDs loaded with DOX outperform DOX alone with reduced toxicity to normal cells. Biodistribution study of Suc CDs revealed prolonged tumour site accumulation. This research demonstrates that renal clearable Suc CDs loaded with DOX exhibit superior anti-cancer activity, and are free of side effects, suggesting promising therapeutic potential for human RCC.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11951162/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Asad A Thahe, Ali Dahi, Motahher A Qaeed, Omar F Farhat, Hazri Bakhtiar, Nageh K Allam
{"title":"Engineered etching and laser treatment of porous silicon for enhanced sensitivity and speed of Pt/n-PSi/Pt UV photodetectors.","authors":"Asad A Thahe, Ali Dahi, Motahher A Qaeed, Omar F Farhat, Hazri Bakhtiar, Nageh K Allam","doi":"10.1039/d5na00137d","DOIUrl":"10.1039/d5na00137d","url":null,"abstract":"<p><p>Silicon-based photodetectors offer notable advantages in cost, performance, and reliability. However, while nanoscale silicon (porous silicon, PSi) effectively emits visible light, it remains inefficient as an indirect-bandgap semiconductor. To improve its optoelectronic properties, coupling silicon with a wide-bandgap semiconductor is a promising strategy. In this study, nanoporous silicon (n-PSi) films were fabricated from an n-type Si (111) wafer using optimized photoelectrochemical etching (PECE). These films were then irradiated with Q-switched Nd:YAG laser pulses (3, 5, 10, and 20 pulses) at a fixed wavelength of 1068 nm, with pulse durations ranging from 3 to 20 ns and a constant repetition rate of 10 Hz. The structural, morphological, and optical properties of both as-prepared and laser-annealed n-PSi samples were characterized using various analytical techniques. Among the laser-treated samples, n-PSi subjected to three laser pulses exhibited the highest crystallinity and largest crystallite size (∼87.02 nm). This optimized sample was selected for fabricating a Pt/n-PSi/Pt metal-semiconductor-metal (MSM) ultraviolet (UV) photodetector. The photoluminescence spectra of the fabricated devices revealed strong near-band-edge (NBE) emission, with a violet band centered around 523 nm, corresponding to a bandgap energy of 2.36 eV. The <i>I</i>-<i>V</i> characteristics of the MSM UV photodetectors were analyzed under dark conditions and 380 nm UV illumination. The device demonstrated high photosensitivity (951.28), excellent responsivity (2.01 A W<sup>-1</sup>), and fast response (0.44 s) and recovery (0.48 s) times, outperforming conventional photodetectors. This approach provides a viable pathway for tuning nanomaterials with tailored properties for high-performance nanodevices. The fabricated MSM UV photodetectors show great potential for next-generation optoelectronic applications.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11960784/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143772688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Md Shahinoor Alam, Mohammad Asaduzzaman Chowdhury, Md Saiful Islam, Md Moynul Islam, Tasmina Khandaker, M A Gafur, Dipa Islam
{"title":"Tailoring the thermal and thermomechanical characteristics of novel MAX phase boron composites in high-temperature applications.","authors":"Md Shahinoor Alam, Mohammad Asaduzzaman Chowdhury, Md Saiful Islam, Md Moynul Islam, Tasmina Khandaker, M A Gafur, Dipa Islam","doi":"10.1039/d5na00063g","DOIUrl":"https://doi.org/10.1039/d5na00063g","url":null,"abstract":"<p><p>MAX phase composites are gaining great attention for their excellent attributes in high-temperature applications like aerospace, energy, and nuclear industries. However, tailoring their thermal and thermomechanical properties for better performance at elevated temperatures remains a significant challenge. Therefore, the aim of this study is to synthesize novel MAX phase boron (B) composites for high-temperature applications. Titanium aluminum nitride (Ti<sub>4</sub>AlN<sub>3</sub>) and titanium aluminum carbide (Ti<sub>3</sub>AlC<sub>2</sub>) MAX phase reinforced B composites were prepared using the hot-pressing method at three different sintering temperatures: 1050 °C, 1250 °C, and 1325 °C. Thermal stability, thermal conductivity and thermomechanical properties of MAX phase composites were investigated through thermogravimetric analysis (TGA), hot disk method, and thermomechanical analyzer (TMA). The results reveal that thermal stability and thermal conductivity increased with rising sintering temperatures for both MAX composites. This is because higher sintering temperatures enhance atomic diffusion, densification, and particle bonding, leading to improved thermal stability and thermal conductivity of the composite. Moreover, the thermal stability of the Ti<sub>4</sub>AlN<sub>3</sub> composite is higher than that of the Ti<sub>3</sub>AlC<sub>2</sub> composites. At 1325 °C sintering, Ti<sub>3</sub>AlC<sub>2</sub> composites remain stable up to 600 °C with 1.4% weight loss, while the Ti<sub>4</sub>AlN<sub>3</sub> composite shows better stability up to 700 °C with only 0.6% weight loss. These MAX phase composites also show varying coefficients of thermal expansion (CTEs) at different temperature ranges, indicating that their thermal expansion properties are highly dependent on sintering temperatures. Both MAX composites exhibit lower overall CTEs at higher sintering temperatures, suggesting enhanced thermal stability. The negative CTEs at higher sintering temperatures in both materials suggest unusual thermal behavior, possibly due to phase transitions, secondary phase formation, or microstructural changes. These findings offer valuable insights into their thermal stability and decomposition characteristics, which are vital for high-temperature applications in electronics, optoelectronics, and semiconductor devices.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11974559/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143811878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yongming Fu, Qianyu Lu, Jianhong Wang, Na Sun, Jinjun Gao, Peng Chen, Jizhou Wu, Jie Ma
{"title":"Pulsed laser synthesis of free-standing Pt single atoms in an ice block for enhancing photocatalytic hydrogen evolution of g-C<sub>3</sub>N<sub>4</sub>.","authors":"Yongming Fu, Qianyu Lu, Jianhong Wang, Na Sun, Jinjun Gao, Peng Chen, Jizhou Wu, Jie Ma","doi":"10.1039/d5na00043b","DOIUrl":"10.1039/d5na00043b","url":null,"abstract":"<p><p>This study reports an innovative synthesis method of a Pt/g-C<sub>3</sub>N<sub>4</sub> single atom catalyst for enhancing photocatalytic hydrogen evolution. The method involves the synthesis of free-standing Pt single atoms within an H<sub>2</sub>PtCl<sub>6</sub> ice block using a pulsed laser reduction process, followed by transferring them onto few-layer g-C<sub>3</sub>N<sub>4</sub> through electrostatic adsorption at low temperature. This approach eliminates the need for high-energy lasers and porous support materials during laser solid-phase synthesis. The photocatalytic activities of Pt/g-C<sub>3</sub>N<sub>4</sub> synthesized under various laser conditions are evaluated to optimize the synthesis parameters. The optimal Pt/g-C<sub>3</sub>N<sub>4</sub> catalyst demonstrates a significantly higher photocatalytic hydrogen evolution capability (320 μmol h<sup>-1</sup>), 129 times that of pure g-C<sub>3</sub>N<sub>4</sub> (2.2 μmol h<sup>-1</sup>). This work expands the laser-solid phase synthesis method, offering a promising route for the production of single atom catalysts with simple operation, clear synthetic pathways, low cost, and environmental friendliness.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11959413/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143772747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Efficient photoelectrochemical oxidation of benzyl alcohol in a microchannel flow cell using compact and mesoporous TiO<sub>2</sub> photoanodes.","authors":"Sirachat Sattayarak, Paravee Vas-Umnuay","doi":"10.1039/d4na01032a","DOIUrl":"10.1039/d4na01032a","url":null,"abstract":"<p><p>Photoelectrochemical (PEC) conversion presents a viable strategy for reducing the external bias required in conventional electrochemical methods for organic molecule valorization. However, the efficiency of PEC processes is largely dependent on photoelectrode characteristics, specifically light absorption and charge transport properties. These properties are crucial for efficient generation of charge carriers and photocurrent for driving reactions. Herein, we report efficient PEC conversion of benzyl alcohol to benzaldehyde using tailored TiO<sub>2</sub> photoanodes of both compact and mesoporous film morphologies in a continuous-flow PEC cell. Notably, our PEC flow cell was designed on a microscale to facilitate superior mass transfer. Parameters such as applied potential, electrolyte flow rate, channel width, and photoanode characteristics were systematically investigated to elucidate their impact on conversion efficiency and selectivity in the PEC oxidation process. The results indicated that at an applied potential of 3.5 V and an electrolyte flow rate of 0.05 ml min<sup>-1</sup>, the microchannel with a width of 0.1 mm, which corresponds to a residence time of 1.6 min, achieved benzyl alcohol conversion exceeding 80%. Comparative analyses with traditional batch H-cells revealed over a fivefold increase in benzyl alcohol conversion in the microchannel flow cell with the mesoporous TiO<sub>2</sub> photoanode. Additionally, the flow cell exhibited approximately threefold higher benzaldehyde selectivity compared to batch reactors employing the compact TiO<sub>2</sub> photoanode. Overall, this work demonstrates the potential of continuous-flow microchannels with tailored photoanodes for achieving efficient and rapid PEC conversions, promising advancements in sustainable organic transformations.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969377/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143795848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}