CRYSTAL RESEARCH AND TECHNOLOGY
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2022
·Vol. 57
·期 7
·2100291
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IF 1.599
Shuang Wang,Minghui Yu,Hao Yu,Yuye Cheng,Minghao Dou,Xiaoyu Gong,Zhiqiang Li,Hongyu Shao,Guangyu Chen,Shenjie Li,Yanyan Chen
The design and construction of Ag 2 S heterostructures capable of significantly separating photocarriers is a significant challenge in photocatalysis. In this study, CdS/Ag 2 S heterojunction composite photocatalyst is fabricated through a simple one-step hydrothermal method. The composite structure is characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflection spectroscopy. Under visible light irradiation, the photocatalytic activity of the sample is evaluated by degradation of methyl orange. The photoelectric chemical performance of the CdS nanoparticles modified by Ag 2 S is closely related to the ratio of Cd/Ag cation. The experimental results show that the sample ACS-2 (CdS-Ag 2 S = 1:1) composite has higher charge transfer/separation efficiency and longer carrier life. The degradation efficiency reaches 74.4% within 30 min, and the degradation rate constant is 0.047 min −1 . After four cycles, the degradation efficiency of the catalyst only decreases slightly, indicating that the CdS/Ag 2 S catalyst has good stability and repeatability. Meanwhile, the study of the photocatalytic mechanism shows that •O 1 − is the primary active substance in the catalytic process, and h + and •OH play a secondary role. This work provides a great significance for constructing efficient Ag 2 S-based heterojunction photocatalyst systems.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Progress in Natural Science-Materials International
·
2019
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IF 3.31
Jun Liu,Lu Chen,Hangsheng Yang,Ze Zhang,Yong Wang
It is well known that for a nanoparticle the solid-solid phase transition begins with the appearance of a high temperature disordered phase at the surface and the phase interface moves inward gradually with the increase of temperature. However, the size-dependent phase transition behavior remains unclear. Here we report an in-situ TEM study of the phase transition process of different-sized Ag 2 S nanoparticles at atomic resolution. The onset temperature of disordered phase of the small nanoparticle is found to be lower than that of the big nanoparticle. And, the disordered phase thickness of small nanoparticle is always thicker than that of big nanoparticle. By considering surface and interface free-energy, a phenomenological model based on the minimization of system free-energy is established, which could well explain our experimental results. These discoveries extend our understanding of size dependent phase transition mechanism.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Yaru Shi,Mingxiu Liu,Yuting Zou,Yahui Li,Xingyu Zhao,Junru An,Mengqi Che,Fan Tan,Xiaojuan Sun,Dabing Li,Shaojuan Li
Broadband photodetectors have drawn intensive attention owing to their wide application prospects in optical communication, imaging, astronomy, and so on. Two-dimensional transition-metal dichalcogenides (TMDs) are considered as highly potential candidates for photodetection applications, benefiting from their excellent photoelectric properties. However, most of the photodetectors based on TMDs suffer from low performance in the near-infrared (NIR) region due to the weak optical absorption efficiency near their absorption band edge, which severely constrains their usage for broadband optoelectronics. Here, by taking advantage of the high absorption coefficient and environment-friendly property of Ag2S quantum dots (QDs), the hybrid of multilayer MoSe2/Ag2S QDs is demonstrated with a high-performance broadband photodetection capability (532–1270 nm). The favorable energy band alignment of MoSe2/Ag2S QDs facilitates effective separation and collection of photogenerated carriers, and the heterostructure device exhibits significant enhancement of performance compared to the bare MoSe2 device. High responsivity, detectivity, and external quantum efficiency of 25.5 A/W, 1.45 × 1011 Jones, and 1070% are obtained at a low working voltage of 1 V under 980 nm illumination. The responsivity of the device can reach up to 1.2 A/W at 1270 nm wavelength, which is competitive to the commercial NIR photodetectors. Meanwhile, broadband imaging capability is demonstrated. Our work may open up a facile and eco-friendly approach to construct high-performance broadband photodetectors for next-generation compact optoelectronic applications.
研究领域:
材料科学
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光电子学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Wei Fu,Jiajie Fan,Quanjun Xiang
ABSTRACT The production of renewable fossil fuels such as CH 4 and CO by photocatalytic CO 2 reduction has attracted more and more attention. However, single photocatalyst is less efficient for photocatalytic reduction of CO 2 due to the fast recombination of photogenerated electron pairs. Herein, we successfully prepare CdS-Ag 2 S composite by assembling the Ag 2 S QDs cocatalyst on the surface of CdS nanosheet-assembled flower through oil-bath solvothermal method . This composite is prepared through a simple self-assembly strategy using cadmium chloride, ammonia and thiourea as precursors of the CdS nanosheet-assembled flower and silver nitrate and 3-mercaptopropionic acid as the precursors of Ag 2 S QDs. The average diameter of Ag 2 S QDs is apparently 6.0 nm. The light absorption edge of the composite is at around 560 nm, with the corresponding band gap at 2.14 eV. The CdS-Ag 2 S QDs composite with 5 wt% Ag 2 S QDs loaded achieves CO evolution rate of 16.6 μmol•g −1 •h −1 without noble-metal cocatalysts. This strengthened photocatalytic performance and photocatalytic stability were attributed to the energy band broadening of Ag 2 S QDs caused by quantum size effect and the large specific surface area due to the assembled flower. The mechanism underlying the enhanced photocatalytic CO 2 reduction activity is further proposed. This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2018
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IF 4.484
Jun Liu,Lu Chen,Hangsheng Yang,Ze Zhang,Yong Wang
Surface induced order–disorder phase transition has been widely studied on flat bulk surfaces, while such a transition is poorly understood on curved surfaces in nanoscale. Here, we report a direct observation of the dynamic behaviors of surface-initiated disordering in Ag2S nanoparticles using atomic resolution in situ transmission electron microscopy. It was found that the disordering behavior is different from the traditional model that the disordered layer follows a logarithmic thickness dependence with temperature. In particular, the disordering is largely enhanced at higher temperature when the radius of the residual order phase is getting smaller. Moreover, the correlation length of disordered phase was found to be several times larger than the typical value for bulk surfaces. This significantly enhanced disordering in nanoparticles could be attributed to the extra driving force provided by the decreasing of order–disorder interface area.
研究领域:
材料科学
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纳米技术
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物理学
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DOI
高影响因子
FIBERS AND POLYMERS
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2021
·Vol. 23
·期 1
·254-262
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IF 2.153
Jiang Hui-Yu,Ouyang Ze-Yu,Hu Rong,Wan Jun,Zhu Jun-Jiang
Titanium dioxide (TiO 2 ) could improve the self-cleaning performances of cotton fabric owing to its good photocatalytic performances. However, the fast recombination rate of the photogenerated electron-hole pairs and narrow photoresponse range of TiO 2 limit its wide application. In this work, Ag 2 S and reduced graphene oxider (rGO) were compounded with TiO 2 , and the composite was loaded on the surface of cotton fabric by hydrothermal method to enhance the self-cleaning performance of cotton fabric. The close contact between Ag 2 S and TiO 2 increases the light response range. Then, rGO could effectively transfer photogenerated electrons, prolong the recombination time of carriers and improve the photocatalytic efficiency. The cotton fabric was characterized by XRD, SEM, Raman and fluorescence spectra. The photocatalytic degradation of methylene blue under visible light was studied. The results showed that TiO 2 /Ag 2 S/rGO adhered uniformly on the surface of cotton fabric and had good adhesion properties. In addition, under visible light irradiation, cotton fabric has excellent photocatalytic self-cleaning performance, washing resistance and rub resistance.
研究领域:
材料科学
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纺织工程
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环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 16
·21297-21307
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IF 2.478
Cao Yong,Luo Penghui,Xu Yang,Zhang Cong,Tian Chang,You Yuanqi,Tian Meiling,Wang Liqiong,Zhou Shenggang
In this paper, a hydrothermal synthesis method synthesized a foamed nickel (NF)-supported Ag-doped Ag 2 S@MoS 2 hydrogen evolution catalyst. Silver doping can improve the conductivity of MoS 2 , thereby improving the hydrogen evolution activity of MoS 2 . Compared with a single MoS 2 , the Ag 2 S@MoS 2 electrode has a larger specific surface area and has many highly catalytic S edges. In 1 M KOH, the overpotential of Ag 2 S@Ag 0.33 MoS 2 /NF electrode at 10 mA cm −2 is approximately 188 mV. Comparing with the overpotential of NF (391 mV) and MoS 2 /NF (290 mV), it is much lower. Further changing the amount of silver added, the overpotential of Ag 2 S@Ag 0.5 MoS 2 /NF is further reduced to 165 mV at a current density of 10 mA cm −2 . When the voltage is 0.35 V, the current densities of Ag 2 S@Ag 0.33 MoS 2 /NF (42.45 mA cm −2 ) and Ag 2 S@Ag 0.5 MoS 2 /NF (55.5 mA cm −2 ) are higher than those of NF (4.91 mA cm −2 ) and MoS 2 /NF (20.51 mA cm −2 ).
研究领域:
材料科学
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电化学
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催化
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Hualai Wang,Fubin Pei,Chun Liu,Yue Ni,Mingzhu Xia,Shasha Feng,Qingli Hao,Tinghai Yang,Wu Lei
In the paper, a novel fluorescent probe based on Ag 2 S QDs/g-C 3 N 4 composite was synthesized by loading Ag 2 S quantum dots (Ag 2 S QDs) on the surface of g-C 3 N 4 through in-situ synthesis method and developed to detect Nitrofurazone (NFZ) sensitively. The results showed that the linear detection range of Ag 2 S QDs/g-C 3 N 4 to NFZ was 0–30 μM, with a low detection limit of 0.054 μM. The results of time-fluorescence-resolved spectroscopy and UV–vis absorption spectroscopy exhibited that the possible detection mechanism of Ag 2 S QDs/g-C 3 N 4 to NFZ was proposed to be Internal Filtration Effect (IFE). Moreover, Multiwfn wavefunction analysis was employed to uncover the possible interaction between the Ag 2 S QDs/g-C 3 N 4 and NFZ, thereby further revealing the fluorescence detection mechanism from the scale of atoms. Combining experiments and theoretical calculations, we proposed the sensing mechanism of the formation of non-fluorescent ground state complex linked by hydrogen bonds. This work indicated that the Ag 2 S QDs/g-C 3 N 4 composite processed the ability to detect NFZ efficiently and sensitively.
研究领域:
分析化学
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环境科学
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食品科学
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产品关联
DOI
PubMed
高影响因子
ANALYST
·
2021
·Vol. 146
·期 20
·6245-6251
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IF 4.616
Qianqian Zhao,Wenrong Cai,Baozhu Yang,Zheng-Zhi Yin,Datong Wu,Yong Kong
Well-dispersed chiral Ag2S quantum dots (Ag2S QDs) were facilely synthesized by using N-acetyl-L-cysteine (NALC) as the chiral ligand and loaded onto nanosheets of two-dimensional (2D) few-layer carbon nitride (C3N4). The resultant nanocomposite (Ag2S QDs/few-layer C3N4) shows enhanced electrochemiluminescence (ECL) while maintaining the chirality of Ag2S QDs, which can be used for the chiral discrimination of the enantiomers of tyrosine (Tyr). Due to the higher affinity of chiral Ag2S QDs toward L-Tyr than toward its enantiomer, the ECL intensity of Ag2S QDs/few-layer C3N4 is significantly decreased after its incubation with L-Tyr, and thus the Tyr enantiomers can be discriminated. The developed ECL chiral sensor exhibits high stability and reproducibility. The universality of the ECL chiral sensor for the discrimination of other chiral amino acids is also studied, and the results indicate that it can work only in the case of chiral aromatic amino acids.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
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IF 3.7
Ruiqi Li,Wenhang Chen,Junqing Li,Chunhong Zhang,Yueling Sun,XiaoYan Tang,Yuan Liu
Membrane separation technology offers a sustainable and efficient solution to wastewater management; however, membrane fouling significantly impedes its application. Photocatalytic membranes, integrating photocatalytic and membrane separation technologies, enhance membrane separation efficacy while effectively mitigating organic and biological contaminations. In this work, Ag2S/PANI@PES composite membranes were prepared via a facile in situ polymerization and successive layer adsorption technique. The modified poly(ether sulfone) (PES) membrane demonstrated improved hydrophilicity and separation performance, and its heterostructure between polyaniline (PANI), Ag0, and Ag2S effectively addressed organic fouling issues. Moreover, Ag2S/PANI@PES exhibited outstanding antimicrobial properties, as well as chemical and mechanical stability.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Ziyi You,Xiaoyang Yue,Dainan Zhang,Jiajie Fan,Quanjun Xiang
In recent years, the use of quantum dots (QDs) cocatalysts to improve the hydrogen evolution activity from the water splitting of photocatalysts has become a popular research topic. Herein, we successfully prepared a novel 0 dimension/2 dimension (0D/2D) heterojunction nanocomposite (denoted Ag 2 S quantum dots (QDs)/g-C 3 N 4 ) with excellent photocatalytic performance by anchoring the Ag 2 S QDs cocatalyst on the surface of g-C 3 N 4 through a self-assembly strategy. Ag 2 S QDs with an average particle size of approximately 5.8 nm were uniformly and tightly modified on g-C 3 N 4 . The Ag 2 S QDs/g-C 3 N 4 composite with 0.5 wt% Ag 2 S QDs loading achieved the highest hydrogen evolution rate of 471.1 μmol·g −1 ·h −1 with an apparent quantum efficiency (AQE) of 1.48% at 405 nm. Such remarkable hydrogen evolution activity far exceeded that of undoped g-C 3 N 4 and Ag 2 S nanoparticles (NPs)/g-C 3 N 4 . Moreover, it was 2.04 times the activity of Pt/g-C 3 N 4 with Pt as the cocatalyst. The enhanced photocatalytic performance was attributed to the energy band broadening of Ag 2 S QDs caused by the quantum size effect and the convenient and effective charge transfer between g-C 3 N 4 and Ag 2 S QDs cocatalysts. The mechanism underlying the enhanced photocatalytic H 2 evolution activity was further proposed. This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Wenhui Ji,Xiaohong Ji,Lin Cao,Qing Yu,Wei Wang
Here, we developed a novel type of composite coating with excellent self-healing and anti-corrosion properties, activated by photothermally responsive nanofillers. The photothermal heterojunction Ag 2 S@Ti 3 C 2 was synthesized and functionalized with a silane coupling agent, and subsequently incorporated into an epoxy resin containing Diels-Alder (DA) bonds. It is found that the heterojunction enhances the light absorption, increases the number and lifetime of photogenerated electron-hole pairs, and facilitates the passage of photogenerated charges through the heterojunction interface, thereby reducing interface transfer resistance and releasing heat. Under irradiation with 808 nm near-infrared light, the photothermal effect of Silane-Ag 2 S@Ti 3 C 2 triggers molecular chain movement and dynamic DA bond reconstruction, thereby repairing scratches in the coating. Surface characterization and electrochemical tests indicate that the coating containing 1 wt% Silane-Ag 2 S@Ti 3 C 2 nanofillers exhibits significant self-healing and anti-corrosion properties. The self-healing rate of the coating approached nearly 96.00 %. After five self-healing cycles, the protective performance of the initial immersion stage was effectively restored, the self-healing rate remained at about 90.00 %. Even after 60 d of immersion, the low-frequency impedance modulus remained above 10 8 Ω·cm 2 . This study presents a novel strategy for the development of multi-cycle self-healing coatings utilizing photothermal effects.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）