CHEMICAL PHYSICS
·
2019
·
IF 1.822
Tong-Tong Zhang,Xiang-Dong Gao,Yong-Qing Wu,Jing-Nan Yang,Xiao-Min Li
Cr-doped BaSnO 3 (BaSn 1-x Cr x O 3 , BSCO-x, x = 0–0.15) thin films with nanoporous structure were deposited on fluorine-doped tin oxide substrates via a colloidal solution route. The BSCO-x films exhibited single cubic perovskite phase and nanoporous feature, with the typical specific surface area of 18.98 m 2 /g and pore size of 10.75 nm (BSCO-0.15). The lowest band gap of 2.68 eV and a high transparency (above 70% in 500–800 nm) were realized in BSCO-0.15 film. This work paves a way toward perovskites with tunable band gap and nanoporous structures for varied photo and photoelectric devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Weixuan Zeng,Xianfeng Yang,Minghui Shang,Xiewen Xu,Weiyou Yang,Huilin Hou
The tailored doping levels towards the band gap tunability are one of the challenges to push forward the potential application of one-dimensional (1D) ZnO nanostructures in the opto/electric nanodevices . In present work, we reported the exploration of Mg-doped ZnO nanofibers via electrospinning of polyvinylpyrrolidone (PVP), Zn(CH 3 COO) 2 (ZnAc) and Mg(CH 3 COO) 2 (MgAc), followed by calcination in air. The resultant products were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscope (HRTEM), and X-ray photoelectron spectroscopy (XPS). The optical measurements (UV–vis) of the Mg-doped ZnO nanofibers suggested that the optical band gaps of the ZnO nanofibers could be tuned from 3.33 to 3.40 eV as a function of the Mg doing levels. This tunability of the band gap of ZnO nanofibers with an intentional impurity could eventually be useful for optoelectronic applications .
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanophotonics
·
2024
·
IF 6.5
Peihan Sun,Xiangmin Hu,Shuhao Yuan,Yanyan Peng,Tingfa Xu,Haizheng Zhong
Miniature spectrometer is powerful tool for scientific research and industrial inspection. Here, we report the fabrication of graded perovskite filters with tunable bandgap and their application in constructing miniature spectrometer. The graded perovskite filters were fabricated using a Finkelstein reaction between in-situ formed halogen ion with a preformed MAPbX 3 film. The graded bandgap of perovskite films can be well tunned from 400 to 750 nm by controlling the volume ratio between 5,5-dimethyl-1-pyrroline N -oxide and benzyl chloride(bromide). By combining a deep residual network, graded bandgap perovskite film and commercial CMOS sensor chip, a miniature spectrometer is demonstrated, achieving an accurate spectrum reconstruction (PSNR = 40.749) with monochromatic spectral resolution of 1.31 nm.
研究领域:
材料科学
·
光学工程
·
人工智能应用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 14
·期 21
·7408-7414
·
IF 3.842
Hao Wei,Shangzhi Chen,Xinglong Ren,Bingjian Qian,Yanjie Su,Zhi Yang,Yafei Zhang
We have reported that the Sn-doped PbSe nanocrystals could be synthesized via a facile solution-based method. Structural and optical characterizations were employed to investigate the properties of the nanocrystals. The x value could be altered across the entire range from 0.58 to 1 by modulating the ratio of cation precursor contents. The band gap energy of the Sn-doped PbSe nanocrystals could be tuned and changed in a nearly linearly way with respect to the x value. Furthermore, using oleylamine as the solvent promoted the nanocrystals to self-assemble as nano-flowers. The theoretical analysis based on first-principles calculations and density of states (DOS) in the VASP code demonstrates the validity of the experimentally obtained band gap variation and values. The band gap energy values at the edge of the solar spectrum render them as competitive candidates for solar applications.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 44
·19422-19426
·
IF 3.829
Weiming Wu,Rui Lin,Lijuan Shen,Ruowen Liang,Rusheng Yuan,Ling Wu
CdS photocatalysts with tunable band gaps (2.17–2.32 eV) were successfully prepared by a solvothermal method. Photocatalytic hydrogenation of 4-nitroaniline over the obtained samples was evaluated in the presence of HCO2NH4 as a hole scavenger upon purging with N2 under visible light irradiation (λ ≥ 420 nm). The CdS sample prepared by CdCl2 and sulfur powder in ethylenediamine showed excellent catalytic activity, giving 100% of 4-nitroaniline conversion and 95% of p-phenylenediamine selectivity after 35 min of visible light irradiation. The results of electron spin resonance revealed that its photoexcited holes could efficiently react with HCO2− ions within HCO2NH4 molecules to produce ˙CO2− radicals with strong reductive abilities. Furthermore, photoexcited electrons of the obtained sample exhibited relatively strong reductive abilities as compared to other CdS samples. Therefore, this sample showed the highest catalytic activity among the CdS samples for the photocatalytic hydrogenation of 4-nitroaniline.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 7
·2666-2670
·
IF 0
Meina Wang,Xiangyou Liu,Chuanbao Cao,Cui Shi
Cu–In–S ternary nanocrystals (NCs), with an average size of less than 10 nm, were synthesized in an aqueous solution containing bovine serum albumin (BSA). X-Ray powder diffraction (XRD) and selected-area electron diffraction (SAED) analyses showed that these NCs featured a roquesite structure. The composition of the NCs could be adjusted by controlling the molar ratio of the starting Cu/In precursors in the reaction solution, which led to a tunable band gap ranging from 1.48 eV to 2.30 eV. Cytotoxicity testing showed that the BSA-stabilized Cu–In–S NCs had little effect on the cell viability, which suggested that they are user-friendly and environmentally benign. With low cost, minimal energy input and environmental impact, this simple approach shows great potential for industrial applications.
研究领域:
材料科学
·
纳米技术
·
生物学
·
环境科学
✓ 已验证
DOI
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 8
·2127-2137
·
IF 3.146
Luo Ze,Li Jinlong,Sui Guozhe,Zhuang Yan,Guo Dongxuan,Xu Rongping,Liang Shuang,Yao Hong,Wang Chao,Chen Shijie
Developing an efficient, environmentally friendly, and pollution-free catalyst with excellent visible light catalytic activity is a promising strategy for dye wastewater treatment. Herein, the rod-like hollow BiOCl x Br 1− x (x=1, 0.75, 0.5, 0.25, 0), with an adjustable band gap, was successfully prepared using Bi-based metal-organic framework as template. The corresponding hollow assembly and introduction of Br − imparted valuable structural advantages and intrinsic characteristics for improved photocatalytic activity. Significantly, the degradation efficiency of BiOCl 0.5 Br 0.5 for the Rhodamine B (RhB) solution reached 92% under visible light illumination for 90 min, which is considerably higher than that of CAU-17-derived Bi 2 O 3 and BiOCl. Overall, these findings shed fundamental insight on constructing novel photocatalysts with excellent visible light driven photocatalytic activity and offered a new method for treating dye wastewater.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Xue Ren,Zhe-Yong Chen,Hui-Ling Hu,Yi Liu,Feng-Lei Jiang
Due to their tunable bandgaps, mixed-halide perovskites (MHPs), such as CsPbBrxI3–x (0 < x < 1), have excellent prospects for tandem solar cells and wavelength-tunable light-emitting diodes (LEDs). Yet MHPs experience light-induced halide phase segregation (LIHPS) when exposed to light or an electric field, and the origin of this is still under debate. In this work, it was discovered that local electric fields caused by vacancy defects stimulated ion migration under the synergistic influence of strain. These findings were based on the observation that tetrabutylammonium bromide (TBAB) considerably suppresses LIHPS. The significance of minimizing surface defects by ligand passivation was emphasized so as to suppress LIHPS. In years to come, it is anticipated to attain stable mixed-halide perovskites with bandgap tunability under electrical bias or light-induced conditions, which is essential for applications including tandem solar cells and wavelength-tunable LEDs.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·819
·
IF 4
Xiang Wang,Xidan Zhang,Yifei Qu,Tian Liu,Juejing Luo,Ting Long,Liang Wu,Chong Tian,Yu Hu
Due to its broad-spectrum antibacterial activity, norfloxacin (NOR) has been widely used over the past few decades. However, the residual NOR in aquatic ecosystems could pose risks to human health from bacteria with resistance genes that potentially cause serious infectious diseases. Herein, a series of bandgap-tunable ZnxCd1−xS (x = 0~1) solid solutions were hydrothermally synthesized and used for NOR photodegradation under visible light and natural sunlight. Benefitting from the suitable bandgap, band structure, and unique tetrapod shape nanostructure, the Zn0.1Cd0.9S solid solution exhibited the best photocatalytic activity, with high degradation efficiencies of 83.23% and 86.28% under visible light and natural sunlight, respectively, within 60 min, which is remarkable among reported ZnxCd1−xS-based photocatalysts and other materials. The in situ reactive-species trapping experiment revealed that holes (h+) were the primary species, and a possible photodegradation mechanism was thus suggested. Moreover, Zn0.1Cd0.9S also exhibited decent reusability and stability after five cycles of experiments. This work provides a comprehensive exploration of the application of bandgap-tunable ZnxCd1−xS solid solutions for NOR photodegradation under visible light and natural sunlight, demonstrating the promising application of as-synthesized Zn0.1Cd0.9S in the photocatalytic degradation of antibiotics.
研究领域:
环境科学
·
材料科学
·
化学工程
·
光催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qunwei Shu,Xueli Wang,Yanling An
Bandgap tunability plays an important role in controlling the photophysical properties of semiconductor material. In this work, we propose a powerful carbon component engineering strategy for regulating the optical bandgap of scandium/cysteine functional materials (Sc/Cys-FMs) that are synthesized by a facile one-pot hydrothermal method. The band structure of Sc/Cys-FMs is closely related to the Cys ligands. As Cys amount rises, the obtained Sc/Cys-FMs exhibit the red-shifted room-temperature phosphorescence (RTP) emission from Sc/Cys-FMs-50 (3.01 eV) to Sc/Cys-FMs-150 (2.14 eV), accompanied by a decrease in quantum efficiency and an increase in lifetime. Meanwhile, the Sc/Cys-FMs show a unique time-dependent phosphorescence color (TDPC) phenomenon, with a dynamic transition of RTP color from yellow to green as the decay time prolongs because of the emission-dependent lifetime. As the amount of Cys further increases, the bandgap can be continuously reduced to 1.88 eV (Sc/Cys-FMs-300) and 1.56 eV (Sc/Cys-FMs-600), causing the quenching of RTP emission and significantly enhanced photothermal properties. The continuously decreasing bandgap has been proven to be directly ascribed to the increase of carbon component in Sc/Cys-FMs. Considering the TDPC properties, Sc/Cys-FMs can be well used for dynamic phosphorescent anti-counterfeiting. This work not only develops a scalable method for preparing functional materials with superior RTP and photothermal properties, but also proposes the carbon component engineering strategy to achieve bandgap tunability of materials.
研究领域:
材料科学
·
光学物理
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）