Journal of Materials Chemistry A
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2015
·Vol. 4
·期 2
·466-477
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IF 7.443
Bo Li,Enyan Guo,Chengxiang Wang,Longwei Yin
We developed a facile strategy for the fabrication of uniform Au inlaid Zn2SnO4/SnO2 hollow rounded cubes with an adjustable Au loading content using ZnSn(OH)6 as the precursor, chloroauric acid as the Au source and ascorbic acid as the reducing agent. The Au inlaid Zn2SnO4/SnO2 hollow rounded cubes show enhanced light absorption ability and reduced recombination rate of photogenerated electron–hole pairs compared with pure Zn2SnO4/SnO2. The hollow rounded cube structured Au–Zn2SnO4/SnO2 sample displays a high surface area and high dye adsorption ability. As photoanodes for DSSCs, the Au–Zn2SnO4/SnO2 hollow rounded cubes demonstrate a greatly enhanced Jsc and an improved power conversion efficiency of up to 2.04%, almost 73% higher compared to the photovoltaic conversion efficiency of pure Zn2SnO4/SnO2 based DSSCs. The greatly improved power conversion efficiency of DSSCs based on the Au inlaid Zn2SnO4/SnO2 photoanode can be attributed to the following three factors. Firstly, the localized surface plasmon resonance of Au nanoparticles plays a crucial role in the enhancement of visible light absorption. Secondly, the potential barrier on the Zn2SnO4/SnO2 surface caused by Au nanoparticles can suppress electron–hole recombination, diminish the loss of electrons during the transfer process and improve the photocurrent density. Thirdly, the enhanced photovoltaic performance can also be attributed to the unique structural characteristics of hollow rounded cubes.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Ziwen Ding,Feiyu Zhang,Haotian Zheng,Yunhe Zhao,Mengfei Ma,Man Zhang,Hongpeng Li,Guodong Li,Siqi Li
Hydrogen sulfide (H 2 S), emerges as a toxic gas that poses significant threats to human life and health, even at low concentrations (100 ppb). Therefore, the detection and monitoring of H 2 S are crucial for ensuring mining safety. Herein, zinc stannate (Zn 2 SnO 4 , ZTO) was synthesized using hydrothermal method, and copper-doped zinc stannate material (xCuZ) were synthesized by in-situ derivation of metal organic frameworks (MOFs). A ppb-level H 2 S gas sensor with rapid response and recovery was developed. The material with a Cu addition of 20 wt% (20CuZ) exhibited the optimal performance, with a sensitivity of 8 to 10 ppm H 2 S at 275 °C, which was approximately 8 times higher than that of pure ZTO, and surprisingly, exhibited high signal-to-noise ratio and rapid response and recovery characteristics (21 s/27 s) at ultra-low concentrations of 10 ppb. The improvement in gas sensing performance can be primarily attributed to the significant adsorption capability of Cu for H 2 S. Furthermore, the incorporation of Cu into the ZTO material induces lattice defects and increases the concentration of oxygen vacancies, thereby enhancing the gas sensing performance. The sensor produced in this study has the potential to mitigate the risks with mining operations while advancing the development of gas sensor technology.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Weili Ye,Jin Li
Achieving highly selective, highly responsive detection of formaldehyde gas at ppb level at room temperature is highly challenging for air monitoring and life health observation. Therefore, in this paper, low-cost, easy-to-fabricate, highly responsive as well as highly selective Zn 2 SnO 4 /SnO 2 (ZTO/SnO 2 ) metal-oxide semiconductor gas sensors have been successfully prepared by using one-pot hydrothermal method . The results showed that the synergistic effect of the n-n heterojunction formed between ZTO/SnO 2 prepared by this method led to a substantial increase in the sensitivity to the target gases, and ZTO/SnO 2 -3 a higher response (291) to 100 ppm formaldehyde compared to the response values of pure samples of Zn 2 SnO 4 (20.4) and pure SnO 2 (6.99) at room temperature. In addition, the response value for formaldehyde reached about 16.5–295 times higher than that for other common hazardous gases (100 ppm) in our lives. The ZTO/SnO 2 -3 sample with 1 mol/L NaOH was homogeneous and small, exposing as much surface as possible, and the theoretical minimum detection limit was calculated to be 50 ppb. Therefore, the large specific surface area and active adsorption/interaction sites are favorable for gas sensing. This work provides an excellent way to prepare gas-sensitive characteristic sensors using NaOH to improve the surface structure.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haiyang Zhang,Xiujuan Ma,Hongyan Zhang
A CeO 2 /Zn 2 SnO 4 ammonia (NH 3 ) sensor with excellent sensing performance was prepared by a one-step hydrothermal method, and the effect of surface oxygen vacancies on the performance of the sensor was analyzed by density functional theory (DFT). Experimental results show that the construction of CeO 2 /Zn 2 SnO 4 heterojunction can improves the content of oxygen vacancies on the surface of Zn 2 SnO 4 , which provides more adsorption active sites for NH 3 molecules and effectively improves the gas sensing performance of the sensor. DFT results indicate that surface oxygen vacancies facilitate the charge transfer caused by the adsorption of NH 3 molecules by CeO 2 , thereby increasing the binding energy of NH 3 molecules. Additionally, the surface oxygen vacancies can cause the structure of Zn 2 SnO 4 to deform during the adsorption of NH 3 , leading to significant electron hybridization and thereby increasing the binding energy of NH 3 molecules. In addition, CeO 2 /Zn 2 SnO 4 sensor was successfully applied to detect the NH 3 gas concentration released by different levels of freshness of beef, providing an effective method for monitoring the freshness of high-protein foods.
研究领域:
材料科学
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气体传感器
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食品质量监测
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纳米材料
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表面化学
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Zhengdao Li,Qiyang Li,Xiaodi Liu,Chuanyun Yang,Yong Zhou
A series of hierarchical N, S co-doped ZnSnO 3 /Zn 2 SnO 4 porous hollow octahedrons (NS/ZnSnO 3 /Zn 2 SnO 4 ) were constructed using the strategy of combining acid-etching technique with in-situ decoration method for the removal of various pollutants in aqueous environment. The optimized NS/ZnSnO 3 /Zn 2 SnO 4 exhibited an enhanced photocatalytic activity under simulated sunlight, removing heavy metal ion Cr(VI) in 140 min and rhodamine B (RhB) in 50 min, outperforming hollow Zn 2 SnO 4 and ZnSnO 3 /Zn 2 SnO 4 octahedrons. This raise could be attributed to the synergetic effect of ZnSnO 3 /Zn 2 SnO 4 heterojunctions, the introduction of N, S elements and unique hierarchical porous hollow morphology. In addition, the photocatalytic activities of NS/ZnSnO 3 /Zn 2 SnO 4 for removing Cr(VI) and RhB from mixed pollutant solutions were 1.94 and 1.53-folds as high as those of single system, and it also displayed good reusability and stability in co-existing system, suggesting its potential practical applications in the simultaneous removal of various pollutants from contaminated water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mengjie Sun,Chang Yin,Zichao Yan,Zi-Jin Wei,Zhouyu Zhang,Wei Wang,Zhi Yuan
Persistent luminescence (PersL) nanoparticles (PLNPs) with excitation-afterglow emission separation character, have brought luciferous prospect for ultrasensitive optical detection to circumvent the weakness of clinical fluorescence modality, benefiting from the strengths of autofluorescence-free, low phototoxicity and superior photostability. Nevertheless, small dimensions of PLNPs (<200 nm, suitable for in vivo diagnosis) synthesized via current procedures are inevitably accompanied with PersL brightness sacrifice. Whereas the past few years have witnessed advances to promote the performance of nanophosphor, proposing a versatile and sustainable approach to boost the excitation absorption capacity, thus amplifying the PersL is of industrywide urgency. Here, we first report a “lanthanide-chelate sensitization” strategy involving Eu-DOTA as strong photon harvester and Zn 2 SnO 4 : Cr 3+ , Eu 3+ (ZSCE) PLNPs as matched acceptor to steadily augment the intensity of obtained ZDE PLNPs via efficacious Förster-type energy transfer. Photobleaching resistant ZDE PLNPs with different DOTA-Eu substitutions enable maximal 3.9-fold luminous brightness and 1.4-fold decay lifetime over bare PLNPs. Cladded with hyaluronic acid (HA), [email protected] PLNPs performed high signal-to-noise ratio imaging and accurate tumors boundary depicting which facilitates PersL-guided breast tumors excision. Strikingly, the “Ln-chelate sensitization” concept could serve as an extensible approach to optimize existing PLNPs, which lightens up new perspectives for ultra-contrastive malignancy navigation.
研究领域:
材料科学
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生物医学工程
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纳米技术
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光学成像
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DOI
高影响因子
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