Nanoscale Research Letters最新文献

{"title":"Modulation of ZnO Nanostructure for Efficient Photocatalytic Performance","authors":"Peng Long,&nbsp;Hao Peng,&nbsp;Bolin Sun,&nbsp;Jinshen Lan,&nbsp;Jing Wan,&nbsp;Yuchen Fei,&nbsp;Xiaofang Ye,&nbsp;Shanzhi Qu,&nbsp;Gengnan Ye,&nbsp;Yilin He,&nbsp;Shengli Huang,&nbsp;Shuping Li,&nbsp;Junyong Kang","doi":"10.1186/s11671-022-03760-x","DOIUrl":"10.1186/s11671-022-03760-x","url":null,"abstract":"<div><p>Structure has been considered to play an important role in photocatalytic performance of the semiconductors, but the intrinsic factors were rarely revealed. Herein, ZnO nanomaterials in the structures of thin film, nanowire array and nanosheet array were synthesized, and their structural characteristics, optical properties, photocurrent response and photocatalytic efficiency were compared with each other for illustrating the issue. The photoluminescence intensity decreased in the order of nanosheets, thin film and nanowires for improved lifetime of the photoexcited charges. The absorption of the nanosheets and nanowires improved obviously in the visible range with a redshift of the absorption edge than that of the thin film. The nanowires possessed the highest response current of 82.65 μA at a response time of 2.0 ms in a sensitivity of 87.93 at the light frequency of 1 Hz, and gained the largest catalytic efficiency of 2.45 μg/cm² h for the methylene blue degradation in UV light. Nevertheless, the improvement of catalytic efficiency of the nanosheets (up to 42.4%) was much larger than that of nanowires (5.7%) and thin film (2.6%) for the Au coating. The analysis revealed that the photocatalytic efficiency of the ZnO nanomaterials was modulated by the structure as it contained different surface area, roughness, defect and doping states, vacancies, polar and non-polar crystalline faces, which would provide structural design of semiconductor nanomaterials for the photoelectric and photocatalytic applications.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9733757/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10378532","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":"Rheological Behavior of SAE50 Oil–SnO2–CeO2 Hybrid Nanofluid: Experimental Investigation and Modeling Utilizing Response Surface Method and Machine Learning Techniques","authors":"Mojtaba Sepehrnia,&nbsp;Mohammad Lotfalipour,&nbsp;Mahdi Malekiyan,&nbsp;Mahsa Karimi,&nbsp;Somayeh Davoodabadi Farahani","doi":"10.1186/s11671-022-03756-7","DOIUrl":"10.1186/s11671-022-03756-7","url":null,"abstract":"<div><p>In this study, for the first time, the effects of temperature and nanopowder volume fraction (NPSVF) on the viscosity and the rheological behavior of SAE50–SnO₂–CeO₂ hybrid nanofluid have been studied experimentally. Nanofluids in NPSVFs of 0.25% to 1.5% have been made by a two-step method. Experiments have been performed at temperatures of 25 to 67 °C and shear rates (SRs) of 1333 to 2932.6 s⁻¹. The results revealed that for base fluid and nanofluid, shear stress increases with increasing SR and decreasing temperature. By increasing the temperature to about 42 °C at a NPSVF of 1.5%, about 89.36% reduction in viscosity is observed. The viscosity increases with increasing NPSVF about 37.18% at 25 °C. In all states, a non-Newtonian pseudo-plastic behavior has been observed for the base fluid and nanofluid. The highest relative viscosity occurs for NPSVF = 1.5%, temperature = 25 °C and SR = 2932.6 s⁻¹, which increases the viscosity by 37.18% compared to the base fluid. The sensitivity analysis indicated that the highest sensitivity is related to temperature and the lowest sensitivity is related to SR. Response surface method, curve fitting method, adaptive neuro-fuzzy inference system and Gaussian process regression (GPR) have been used to predict the dynamic viscosity. Based on the results, all four models can predict the dynamic viscosity. However, the GPR model has better performance than the other models.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9732181/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10377116","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":"Promotion of Specific Single-Transverse-Mode Beam Characteristics for GaSb-Based Narrow Ridge Waveguide Lasers via Customized Parameter Design","authors":"Tianfang Wang,&nbsp;Chengao Yang,&nbsp;Yihang Chen,&nbsp;Jianmei Shi,&nbsp;Hongguang Yu,&nbsp;Xiangbin Su,&nbsp;Yu Zhang,&nbsp;Yingqiang Xu,&nbsp;Zhichuan Niu","doi":"10.1186/s11671-022-03758-5","DOIUrl":"10.1186/s11671-022-03758-5","url":null,"abstract":"<div><p>GaSb-based single-transverse-mode narrow ridge waveguide (RW) lasers with high power and simultaneous good beam quality have broad application prospects in the mid-infrared wavelength region. Yet its design and formation have not been investigated systematically, while the beam characteristics that affect their suitability for specific applications remain rarely analyzed and optimized. The present work addresses these issues by theoretically establishing a waveguide parameter domain that generalizes the overall possible combinations of ridge widths and etch depths that support single-transverse-mode operation for GaSb-based RW lasers. These results are applied to develop two distinct and representative waveguide designs derived from two proposed major optimization routes of model gain expansion and index-guiding enhancement. The designs were evaluated experimentally based on prototype 1-mm cavity-length RW lasers in the 1950 nm wavelength range, which were fabricated with waveguides having perpendicular ridge and smooth side-walls realized through optimized dry etching conditions. The model gain expanded RW laser design with a relatively shallow-etched (i.e., 1.55 <span>(upmu)</span>m) and wide ridge (i.e., 7 <span>(upmu)</span>m) yielded the highest single-transverse-mode power to date of 258 mW with a narrow lateral divergence angle of 11.1<span>(^circ)</span> full width at half maximum at 800 mA under room-temperature continuous-wave operation, which offers promising prospects in pumping and coupling applications. Meanwhile, the index-guiding enhanced RW laser design with a relatively deeply etched (i.e., 2.05 <span>(upmu)</span>m) and narrow ridge (i.e., 4 <span>(upmu)</span>m) provided a highly stable and nearly astigmatism-free fundamental mode emission with an excellent beam quality of M<span>(^2)</span> factor around 1.5 over the entire operating current range, which is preferable for seeding external cavity applications and complex optical systems.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9729666/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10333681","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":"Zero-Dimensional Cs3BiX6 (X = Br, Cl) Single Crystal Films with Second Harmonic Generation","authors":"Junjie Yao,&nbsp;Zhicheng Zhou,&nbsp;Lutao Li,&nbsp;Yuan Chen,&nbsp;Chen Wang,&nbsp;Xiangyi Wang,&nbsp;Zheng Lu,&nbsp;Zhongchao Bai,&nbsp;Qiang Zhang,&nbsp;Xuefeng Huangfu,&nbsp;Yinghui Sun,&nbsp;Hao Xu,&nbsp;Guifu Zou","doi":"10.1186/s11671-022-03759-4","DOIUrl":"10.1186/s11671-022-03759-4","url":null,"abstract":"<div><p>The development of atomically thin single crystal films is necessary to potential applications in the 2D semiconductor field, and it is significant to explore new physical properties in low-dimensional semiconductors. Since, zero-dimensional (0D) materials without natural layering are connected by strong chemical bonds, it is challengeable to break symmetry and grow 0D Cs₃BiX₆ (X = Br, Cl) single crystal thin films. Here, we report the successful growth of 0D Cs₃BiX₆ (X = Br, Cl) single crystal films using a solvent evaporation crystallization strategy. Their phases and structures are both well evaluated to confirm 0D Cs₃BiX₆ (X = Br, Cl) single crystal films. Remarkably, the chemical potential dependent morphology evolution phenomenon is observed. It gives rise to morphology changes of Cs₃BiBr₆ films from rhombus to hexagon as BiBr₃ concentration increased. Additionally, the robust second harmonic generation signal is detected in the Cs₃BiBr₆ single crystal film, demonstrating the broken symmetry originated from decreased dimension or shape change.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9729671/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10327810","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":"Silver Halide-Based Nanomaterials in Biomedical Applications and Biosensing Diagnostics","authors":"Lin Zhang,&nbsp;Hong Zhang","doi":"10.1186/s11671-022-03752-x","DOIUrl":"10.1186/s11671-022-03752-x","url":null,"abstract":"<div><p>In recent years, silver halide (AgX, X = Cl, Br, I)-based photocatalytic materials have received increasing research attention owing to their excellent visible-light-driven photocatalytic performance for applications in organic pollutant degradation, HER, OER, and biomedical engineering. Ag as a noble metal has a surface plasma effect and can form Schottky junctions with AgX, which significantly promotes electron transport and increases photocatalytic efficiency. Therefore, Ag/AgX can reduce the recombination rate of electrons and holes more than pure AgX, leading to using AgX as a photocatalytic material in biomedical applications. The use of AgX-based materials in photocatalytic fields can be classified into three categories: AgX (Ag/AgX), AgX composites, and supported AgX materials. In this review, we introduce recent developments made in biomedical applications and biosensing diagnostics of AgX (Ag/AgX) photocatalytic materials. In addition, this review also discusses the photocatalytic mechanism and applications of AgX (Ag/AgX) and supported AgX materials.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9702141/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40722531","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":"Effects of ITO Contact Sizes on Performance of Blue Light MicroLEDs","authors":"Yu-Hsuan Hsu,&nbsp;Yu-Yun Lo,&nbsp;Yi-Hsin Lin,&nbsp;Hsiao-Wen Zan,&nbsp;Ray-Hua Horng","doi":"10.1186/s11671-022-03754-9","DOIUrl":"10.1186/s11671-022-03754-9","url":null,"abstract":"<div><p>In this study, the effect of ITO contact ratio for blue light micro-light-emitting diode (µLED) with dimensions 40 μm × 40 μm was assessed. The contact ratio from 0.2 to 0.8 was designed for the ratio of electrode area to light-emitting area. As the contact ratio increased from 0.2 to 0.8, the turn-on voltage of µLED decreased. It could be due to the short lateral diffusion length in multiple quantum wells (MQW) and lower parallel resistance for the µLED with a large contact ratio. The leakage currents of single µLED were below 5.1 × 10^–9 A, no matter the contact ratio. It means that the contact ratio does not affect the leakage current as measured on single chip. Moreover, µLED array with a 0.8 contact ratio presented the highest output power than other samples (5.25 mW as the current density of 1875 A/cm²). It could attribute to the MQWs usage, the metal contact reflective behavior and less current crowding, which generated more carriers and extracted more lighting from the µLED. The simulation data using SpeCLED software agreed well with these experiments, and µLED with a 0.8 contact ratio showed the best optoelectronic properties.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9702056/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40706471","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":"Retraction Note: Conductive Gels: Properties and Applications of Nanoelectronics","authors":"Nguyen Dinh Trung,&nbsp;Dinh Tran Ngoc Huy,&nbsp;Maria Jade Catalan Opulencia,&nbsp;Holya A. Lafta,&nbsp;Azher M. Abed,&nbsp;Dmitry Olegovich Bokov,&nbsp;Kahramon Shomurodov,&nbsp;Hoang Van Thuc Master,&nbsp;Ali Thaeer Hammid,&nbsp;Ehsan Kianfar","doi":"10.1186/s11671-022-03746-9","DOIUrl":"10.1186/s11671-022-03746-9","url":null,"abstract":"","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9663761/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40684942","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":"On the Paramagnetic-Like Susceptibility Peaks at Zero Magnetic Field in (hbox{WSe}_{2-x}hbox{Te}_{x}) Single Crystals","authors":"Shiu-Ming Huang,&nbsp;Pin-Cing Wang,&nbsp;Kuo-Yi Hung,&nbsp;Fu-En Cheng,&nbsp;Chang-Yu Li,&nbsp;Mitch Chou","doi":"10.1186/s11671-022-03743-y","DOIUrl":"10.1186/s11671-022-03743-y","url":null,"abstract":"<div><p>A weakly temperature-dependent paramagnetic-like susceptibility peak at zero magnetic field is observed in <span>(hbox{WSe}_{2-x}hbox{Te}_{x})</span> with only marginal amount of ferromagnetic impurities. The ferromagnetic hysteresis loop and the magnetic moment splitting between zero-field-cooled and field-cooled processes indicate ferromagnetism in the samples. The paramagnetic-like susceptibility peak height is proportional to the remanent magnetic moment of hysteresis loops. High-resolution transmission electron microscope image supports that the observed ferromagnetic feature originates from lattice distortion. These results imply that the weakly temperature-dependent paramagnetic-like susceptibility peak originates from weak lattice distortion and/or superparamagnetism.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9649580/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40675915","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":"Passivation and Interlayer Effect of Zr(i-PrO)4 on Green CuGaS2/ZnS/Zr(i-PrO)4@Al2O3 and Red CuInS2/ZnS/Zr(i-PrO)4@Al2O3 QD Hybrid Powders","authors":"Minji Ko,&nbsp;Soyeon Yoon,&nbsp;Yun Jae Eo,&nbsp;Keyong Nam Lee,&nbsp;Young Rag Do","doi":"10.1186/s11671-022-03741-0","DOIUrl":"10.1186/s11671-022-03741-0","url":null,"abstract":"<div><p>Broadband emissive I–III–VI quantum dots (QDs) are synthesized as efficient and stable I–III–VI QDs to be used as eco-friendly luminescent materials in various applications. Here, we introduce the additional passivation of zirconium isopropoxide (Zr(i-PrO)₄) to improve the optical properties and environmental stability of green-emitting CuGaS₂/ZnS (G-CGS/ZnS) and red-emitting CuInS₂/ZnS (R-CIS/ZnS) QDs. The photoluminescence quantum yield (PLQY) of both resultant Zr(i-PrO)₄-coated G-CGS/ZnS and R-CIS/ZnS QDs reaches similar values of ~ 95%. In addition, the photostability and thermal-stability of G-CGS/ZnS/Zr(i-PrO)₄ and R-CIS/ZnS/Zr(i-PrO)₄ QDs are improved by reducing the ligand loss via encapsulation of the ligand-coated QD surface with Zr(i-PrO)₄. It is also proved that the Zr(i-PrO)₄-passivated interlayer mitigates the further degradation of I-III-V QDs from ligand loss even under harsh conditions during additional hydrolysis reaction of aluminum tri-sec-butoxide (Al(sec-BuO)₃), forming easy-to-handle G-CGS/ZnS and R-CIS/ZnS QD-embedded Al₂O₃ powders. Therefore, the introduction of a Zr(i-PrO)₄ complex layer potentially provides a strong interlayer to mitigate degradation of I–III–VI QD-embedded Al₂O₃ hybrid powders as well as passivation layer for protecting I–III–VI QD.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9640527/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40453114","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":"H2O2/pH Dual-Responsive Biomimetic Nanoenzyme Drugs Delivery System for Enhanced Tumor Photodynamic Therapy","authors":"Xinyuan Li,&nbsp;Qing Ji,&nbsp;Chao Yan,&nbsp;Ziyu Zhu,&nbsp;Zhihui Yan,&nbsp;Ping Chen,&nbsp;Yisen Wang,&nbsp;Li Song","doi":"10.1186/s11671-022-03738-9","DOIUrl":"10.1186/s11671-022-03738-9","url":null,"abstract":"<div><p>Phototherapy has been recognized as a photochemical process to treat tumor via induce cancer cells necrosis and death, with minimal invasiveness, higher selectivity, and few side effects. However, the therapy effects of phototherapy are often compromised by the hypoxia, high levels of hydrogen peroxide, and glutathione of tumor microenvironment (TME). Therefore, we constructed a catalase-like activity bionic metal–organic framework drugs delivery system (FA-EM@MnO₂/ZIF-8/ICG) with tumor microenvironment controllable releasing. In this system, photosensitizer indocyanine green (ICG) was introduced into zeolite imidazole salt skeleton 8 (ZIF-8) by one-step methods, forming ZIF-8/ICG nano-platform, which can effectively avoid ICG-induced phototoxicity and aggregation-induced quenching during transport. MnO₂ with catalase-like activity was coated on the surface of ZIF-8/ICG nano-platform, which made it have the ability of self-supplying O₂ under the condition of H₂O₂ in TME. Exposure under near-infrared light can alleviate the anoxic TME, thus improving the phototherapy efficiency. In addition, folate-functionalized erythrocyte membrane is coated on the surface of MnO₂/ZIF-8/ICG, which can endow FA-EM@MnO₂/ZIF-8/ICG with the ability of targeted drug administration and immune elimination avoidance. Therefore, FA-EM@MnO₂/ZIF-8/ICG nano-platform has the catalase-like activity, which can alleviate the oxidative stress state of TME and provide a beneficial environment for photodynamic therapy of tumor.</p></div>","PeriodicalId":715,"journal":{"name":"Nanoscale Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2022-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9618007/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40456091","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}