RSC Advances
·
2017
·Vol. 7
·期 51
·32146-32154
·
IF 3.108
Chengkai Pang,Yuqun Zhuo,Qiyu Weng
A series of Mn-exchanged SAPO-34 catalysts were synthesized and developed as catalysts for the low temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen. 4Mn/SAPO-34 showed the highest SCR activity in the temperature range of 120–210 °C. The microstructure of zeolite supports, acidity, manganese species and reaction mechanism were investigated in detail by BET, NH3-TPD, UV-Vis, H2-TPR, XPS and in situ DRIFTS. Mn3+ and Mn4+ related species were proved to be the active sites for the SCR reaction. The Eley–Rideal mechanism was proved to be effective on 4Mn/SAPO-34 for the low temperature SCR reaction in which coordinated NH4+ species react with gas-phase NO to form an activated transition state and subsequently decomposed to N2 and H2O.
研究领域:
环境科学
·
催化化学
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DOI
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JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 23
·
IF 2.877
Peng Yanyan,Jiang Dayong,Zhao Man
Photodetectors (PDs) that combine inorganic semiconductors with organic lead halide perovskites to produce broader spectral responses have captured great interest from researchers; however, the imperfect perovskite crystallinity and the defects on the film surface are still the main factors inhibiting the PD's capability. Here, we proposed a simple method by introducing ionic liquid [1-butyl-3-methylimidazolium iodide (BMII)] into ZnO/CH 3 NH 3 PbI 3 to encourage the growth of perovskite grains, raise the crystallinity of perovskite, and reduce the trap states, finally enhancing the photoelectric performances. After the addition of BMII, there are 171-fold, 74-fold, and 76-fold increases, respectively, in the light–dark current ratio, the spectral responsivity, and the external quantum efficiency, meanwhile, detectivity can reach 2.58 × 10 13 Jones in the UV–vis range. The impressive results can be owed to the higher carrier concentration of ZnO/CH 3 NH 3 PbI 3 with BMII, which can facilitate the charge transfer and suppress the recombination of photogenerated carriers. This study may be of assistance to extend our knowledge of developing high-performance PDs.
研究领域:
材料科学
·
光学工程
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 22
·2313776
·
IF 18.5
Fapeng Sun,Haojie Xu,Wenting Hong,Zhihua Sun,Wei Liu
Metal thio(seleno)phosphates are renowned for their multifaceted physical characteristics and versatile applications, particularly in optoelectronics. In detection applications, a low and stable dark current is crucial, enhancing the sensitivity and signal-to-noise ratio of detectors. Herein, a van der Waals layered material has synthesized, CuInP 2 Se 6 . Despite its nanometric scale, 2D CuInP 2 Se 6 detector transcends the conventional absorption inefficiencies tied to ultrathin materials. It delivers exceptional ultraviolet–visible detection, characterized by an ultralow, stable dark current of 150 fA, and a noise power density of 27.7 fA Hz −1/2 at room temperature. The in-depth investigation reveals a responsivity of 4.47 A W −1 , an external quantum efficiency of 1369%, a special detectivity of 1.44 × 10 13 Jones, and a rapid response speed of 280 µs, positioning it at the pinnacle of 2D photodetector performance. The CuInP 2 Se 6 ’s ultralow, stable dark current paves the way for X-ray detection, achieving an unprecedented sensitivity of 1.32 × 10 5 µC Gy air −1 cm −2 and a low detection limit of 0.15 µGy air s −1 . Furthermore, 2D CuInP 2 Se 6 detector exhibits a remarkable image-sensing capability, adeptly capturing intricate patterns with high resolution. This discovery indicates its promise in revolutionizing integrated micro/nano optoelectronic devices, opening avenues for advancements in light and X-ray detection and imaging technologies.
研究领域:
材料科学
·
光学
·
医学成像
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高影响因子
Journal of Applied Spectroscopy
·
2026
·
IF 1
Wang J.,Zuo J.,Ma L.,Wang Y.,Chen J.,Li Y.,Zhang H.
The formation of silver nanoparticles (AgNPs) as byproducts during the synthesis of silver nanowires (AgNWs) necessitates accurate quantification of their relative abundances for evaluating practical applications. This study introduces a rapid quantitative approach based on UV-Vis spectral peak deconvolution. By modulating the molecular weight (MW) of polyvinylpyrrolidone (PVP), effective control over the diameter and yield of AgNWs was realized. Experimental results show that low-MW PVP (24 kDa) promotes the formation of short nanorods, intermediate-MW PVP (220 kDa) maximizes the aspect ratio to 370, and high-MW PVP (1300 kDa) reduces it to 310 due to steric hindrance. A novel mixed PVP system (1300 kDa:24 kDa = 2:1) significantly optimizes the nanowire morphology, yielding AgNWs with an aspect ratio of 920. However, competitive adsorption kinetics in this system resulted in a minimum AgNW/AgNP ratio of 0.90. A quantitative model correlating the average diameter of AgNWs with their characteristic UV-Vis absorption peak (370–400 nm) was established, enabling rapid diameter estimation through spectral analysis. Gaussian-Lorentzian hybrid functions were used to deconvolute the plasmon resonance peaks of AgNWs (370–400 nm) and AgNPs (450–500 nm), with the ratio of their peak areas employed to determine the proportion of wire-like products. This method shows strong agreement with SEM statistical results (Pearson coefficient = 0.84, R 2 = 0.75). Without requiring complex separation or machine learning, our approach enables rapid determination of AgNW diameters and yields through UV-Vis spectral deconvolution, providing an efficient and cost-effective solution for optimizing industrial synthesis and quality control.
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ACS Omega
·
2022
·
IF 4.132
Danting Xu,Xia Zhu,Jiakun An,Gaoyu Chen,Jianchun Bao,Xiangxing Xu
As a narrow band semiconductor at room temperature and a metallic material above ∼68 °C, functional VO2 films are widely investigated for smart windows, whereas their potential for ultraviolet–visible–infrared (UV–vis–IR) broad spectral photodetectors has not been efficiently studied. In this report, photodetectors based on VO2–ZnO nanocrystal composite films were prepared by nanocrystal-mist (NC-mist) deposition. An enhanced photodetection switching ratio was achieved covering the ultraviolet to infrared wavelength. Due to the synergetic effect of nanosize, surface, phase transition, percolation threshold, and the band structure of the heterojunction, the transfer and transport of photogenerated carriers modulate the device performance. This study probes new chances of applying VO2-semiconductor-based nanocomposites for broad spectral photodetectors.
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产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6474
·
IF 3.623
Huan Shuai,Jiao Wang,Xianguang Wang,Gaoxiang Du
Herein, using black talc as a carrier, a ternary black talc-TiO2/ZnO composite photocatalyst was prepared by the sol-gel method, and the effect of the black talc on the hetero-structure properties of the TiO2and ZnO was systematically studied. The prepared composite photocatalyst showed an excellent degradation performance of the pollutant, where black talc plays an important role in promoting the interface interaction by enhancing the contact area between the TiO2and ZnO. Moreover, the free carbon element doping in black talc favors the formation of more oxygen vacancies, thereby improving the response as a photocatalyst in visible light. In addition, the carbon in the black talc can also adsorb organic pollutants and enrich the surroundings of the photocatalyst with pollutants, so it further improves the catalytic efficiency of the photocatalyst. Under UV irradiation, the degradation rate of Rhodamine B on black talc-TiO2/ZnO was found 3.3 times higher than that of black talc-TiO2with good stability.Keywords:black talc carrier;heterostructure;photocatalyst;TiO2;ZnO
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 40
·13971-13980
·
IF 6.4
Xiaolong Li,Yulu Tang,Chenyu Wang,Tianzhu Wei,Dongjun Lv,Mingyuan Guo,Yongning Ma,Yuhao Yang
UV–Vis–NIR photodetectors play a crucial role in numerous scientific and commercial applications. It is a great challenge to realize UV–Vis–NIR photodetectors due to the limited photoresponse range of single materials, especially photomultiplication type detectors. In this work, a bulk heterojunction strategy is used to construct Y-TiOPc NP and ZnS NR photosensitive materials (Y-TiOPc:ZnS) with outstanding light absorption in the range of 365 nm to 940 nm. The photodetector based on Y-TiOPc:ZnS (YZ-PD) exhibits an obvious photomultiplication phenomenon and excellent photodetection performance with the maximum external quantum efficiency (EQE) of 2985.5% and a photoresponsivity (R) of 8782 mA W−1 under a low-intensity of 0.01 mW cm−2. Moreover, the photocurrent response curves are all prompt, steady and reproducible during repeated on/off cycles under different exposure wavelengths. Such high performances can be attributed to the complementary absorption spectra of Y-TiOPc NPs and ZnS NRs, the improvement in carrier generation efficiency, separation efficiency, and transmission rate caused by bulk heterojunctions, and the enhancement of external hole tunneling injection efficiency assisted by interfacial trapped electrons. This work demonstrates that the construction of bulk heterojunctions by incorporating UV photosensitive materials and Vis–NIR photosensitive materials has immense potential to prepare highly sensitive broadband photomultiplier detectors, which may inspire further research on high-performance full spectrum photodetectors.
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高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 13
·5447-5453
·
IF 1.821
Haiqian Zhao,Jihui Gao,Wei Zhou,Zhonghua Wang,Shaohua Wu
The reason for the prominent error in the hydroxyl radical detection method by UV-vis spectrophotometry with fast blue BB salt (FBBs) as the chromogenic agent was detected, and a modified method was proposed. The simultaneous extraction of FBBs in the diazosulfone extraction process was proven to have a distinct influence on the test results. In the modified method, FeSO4 was adopted to limit the extraction of FBBs by a toluene/butanol extraction agent, which sharply decreased the influence of FBBs on diazosulfone detection. The FBBs amount and extraction time played an important role in its extraction. The appropriate FBBs/MSIA ratio was 50, and the reasonable extraction time was 300 s for the modified method. ˙OH concentration in the directional decomposition of the Fenton system was detected. The test error was about 7%. This method is quite significant to test ˙OH quantificationally to better understand Fenton reaction mechanisms and promote the generation of ˙OH.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Ruobai Li,Jing Kong,Haijin Liu,Ping Chen,Yuehan Su,Guoguang Liu,Wenying Lv
The extensive production and use of non-steroidal anti-inflammatory drugs (NSAIDs) has increased the volume of downstream residues that contaminate the environment, which pose great threats to ecosystems and human health. The decomposition of peroxydisulfate (PDS), which is activated by UV–vis to produce a potent oxidizing sulfate radical, comprises a new type of advanced oxidation technology. The degradation of indomethacin (IM) by the UV–vis activation of peroxydisulfate was investigated. The results demonstrated that IM degradation followed pseudo-first-order reaction kinetics. UV–vis irradiation led to the direct albeit slight photolysis of IM, whereas the addition of an oxidant significantly enhanced the removal efficiency. The IM degradation efficiency was increased when the pH was elevated from 5 to 7; however, the elimination of IM was reduced when the pH was elevated from 7 to 9 due to the conversion of SO 4 − to HO . A low concentration of Cl − had a dual effect, while a high concentration led to a dramatic inhibitory effect. Fulvic acid (SRFA) inhibited the decomposition of IM through the light screening effect and the quenching of radicals. A quenching experiment revealed that SO 4 − was the primary free radical, which is confirmed by electron spin resonance spectroscopy. The second-order rate constants of IM and SO 4 − were also determined. The luminescent bacteria Vibrio fischeri was selected to assess the toxicity of the transformation products, which was further confirmed by quantitative structure-active relationship analysis. The cleavage of the bond between C on the benzene ring and N on the indole group, the hydroxylation of the benzene ring, and the decarboxylation of the aliphatic chain were the main pathways for the degradation of IM in the UV–vis/peroxydisulfate system.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·Vol. 40
·期 2
·279-286
·
IF 3.1
Dou Renju,Wang Qin,Ren Xiaoyan,Lu Lehui
Here we employ in-situ UV-Vis spectroscopy to monitor the sulfur redox reaction with oxygen-containing molecules as an additive, for example, biphenyl-4,4′-dicarboxylic acid (BDC). Furthermore, Raman spectrum, electron paramagnetic resonance (EPR), and electrospray ionization-mass spectrometry (ESI-MS) measurements reveal that the formation of BDC-S
•‒ 3
complexes can establish the long-term stability of polysulfide radicals, change the kinetics of sulfur redox reaction, and then generate decent capacity retention and rate capability. According to the density functional theory (DFT) analysis, S
•‒ 3
radicals are the underlying product of S
2‒ 6
cleavage, owing to the decreased chemical energy and the increased stability of S
•‒ 3
radicals through Lewis acid-base interaction. The assembled Li-S batteries with BDC additive deliver a high reversible capacity of 420 mA·h·g −1 over 200 cycles with over 98% Coulombic efficiency, under the current density of 0.2 C.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 8
·1-13
·
IF 2.5
Yang Duo,Wang Jing,Shi Jun,Ren Jie
In this study, four-element high entropy carbonate solid solutions with Mg as the primary element and three equimolar transition metal elements (Co, Ni, Zn, Fe, Mn and Cu) were successfully prepared using the hydrothermal method. The crystal structure, microstructure, color properties, and reflectance of the synthetic materials were characterized using techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible-near-infrared (UV-Vis-NIR) spectrophotometry. The results indicate that the existence of Cu impacts the formation of solid solution phase, especially in combination with Fe, leading to the formation of a heterophase. By changing the combination of elements, the band gap of the high-entropy carbonate was adjusted from 2.09 eV to 5.56 eV. The colorimetric coordinates, according to CIE 1976 Lab, ranged from L 34.54 ∼ 89.80, a * -22.06 ∼ 5.41, and b * -1.75 ∼ 39.38, allowing for coverage from blue to red tones. The coexistence of Cu and Fe resulted in a deep reddish-brown color, which is likely related to charge transfer transitions. Additionally, different combinations of high-entropy carbonates showed significant differences in near-infrared reflectance, reaching up to 83% in the 780 nm to 2500 nm band range, indicating potential applications in high-reflective insulation materials.
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ENZYME AND MICROBIAL TECHNOLOGY
·
2020
·
IF 3.448
Chuankai Yang,Miaorong Zhang,Wei Wang,Yao Wang,Jianguo Tang
A colorimetric platform based on enzyme-inorganic hybrid nanoflowers was used for ultraviolet-visible detection of hydrogen peroxide (H 2 O 2 ). The hybrid nanoflowers were prepared via incubation at room temperature using horseradish peroxidase (HRP) and copper phosphate (Cu 3 (PO 4 ) 2 ) as the organic and inorganic components, respectively. HRP/Cu 3 (PO 4 ) 2 hybrid nanoflowers (HRP-HNFs) showed linear H 2 O 2 detection range from 100 nM to 100 μM, moreover, HRP-HNFs exhibited good selectivity for H 2 O 2 detection due to the specificity of HRP. In addition, HRP-HNFs have good reusability, excellent color stability and long-term storage stability, which indicate HRP-HNFs are promising for catalysis and biomedical applications.
研究领域:
生物化学
·
分析化学
·
纳米材料科学
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高影响因子
危险品化学品经营许可证（带存储）