CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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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
Small
·
2024
·
IF 13
Yang You,Hanye Xing,Kangkang Li,Yuqing Xie,Meiqi Ye,Yang Lu,Jingzhe Xue
Carbon material is a hot topic in solar evaporation. Due to the widely distributed microorganisms in natural water, biofouling has limited the actual application of solar evaporation material. Although carbon material lacks of nutrition for microbe, it is still vulnerable to biofouling because of the efficient pollutant adsorption property. However, current anti-biofouling design focuses on microbial control, neglects its influence on evaporators light absorption, that is usually a trade-off with evaporation efficiency. Herein, a bioinspired aligned carbon-Ag 2 S scaffold is introduced with synergistical enhanced light absorption (increased to 98.0% from 97.4%) and anti-biofouling property. The bioinspired aligned carbon-Ag 2 S scaffold exhibits a 1.87 kg m −2 h −1 evaporation rate under one sun, superior to pure carbon scaffold (1.78 kg m −2 h −1 ). It also maintains efficient light capture (-97.2%) and evaporation rate (1.73 kg m −2 h −1 ) after bacterial interference, avoiding sharp decline in light absorption (reduced to 83.3–87.6%) and evaporation performance (reduced to 1.24–1.28 kg m −2 h −1 ) which occurs in carbon scaffold due to biofouling. The carbon-Ag 2 S scaffold shows solid advantage in balancing light captures and biofouling control, compared to carbon-ZnO scaffold with conventional anti-biofouling design, which inhibits biofouling sacrificing light absorption (reduced to 89.8%) and evaporation performance (reduced to 1.41 kg m −2 h −1 ).
研究领域:
材料科学
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环境科学
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纳米技术
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Xin Li,Ya Ma,Xiao-Lin Zhong,Li-Shi Wang
In this manuscript, an electrochemical sensor modified with multi-walled carbon nanotubes (MWCNTs) and silver sulfide (Ag 2 S) was prepared by means of potentiostatic deposition method for the detection of 2,4,6-trinitrotoluene. The poloxamer (Px) was then electrodeposition onto the surface of MWCNTs and Ag 2 S as a film-forming material to prevent the leakage of nanomaterial, to improve the stability of the modified electrode and then enhance the current signal, which contributed to the high sensitivity of the electrode. During the electrodeposition process, some influence factors, such as the deposition cycle number, deposition time, and applied potential of silver sulfide, and the deposition time and applied potential of Px have been inspected. Under optimal conditions, the obtained sensor showed good catalytic performance for the reduction reaction of 2,4,6-trinitrotoluene. The proposed sensor also exhibited excellent stability and reproducibility, providing a wide linear ranges from 0.22 to 15.4 μmol L -1 and a low detection limit of 3.23 nmol L -1 (S/N = 3). It also provides a satisfactory result when applied to the actual sample detection.
研究领域:
材料科学
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分析化学
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环境科学
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DOI
高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 1
·112-116
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IF 0.841
Yanling Hu,Chun Deng,Yu He,Yili Ge,Gongwu Song
The work develops a novel method for the detection of bisphenol A (BPA) based on glutathione (GSH)-protected silver sulphide quantum dots (Ag 2 S QDs), which was simple, fast, non-toxic, sensitive and selective. Ag 2 S QDs were synthesised with a sulphur–hydrazine hydrate complex as the S 2− source and GSH as the stabiliser. Ag 2 S QDs, near-infrared QDs, offered the advantages over lower background fluorescence and lower signal loss. The fluorescence peak of Ag 2 S QDs at 650 nm was quenched significantly in the presence of BPA. Good linear correlations were obtained over the concentration range from 0 to 60 μM of BPA under optimised conditions. The developed selective and sensitive method presaged more opportunities for the application in environmental samples.
研究领域:
环境科学
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分析化学
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纳米技术
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Bowen Xiao,Rongyan Yang,Pengyu Chen,Jing Yang,Binbin Sun,Kunkun Wang,Tong Zhang,Lingyan Zhu
Silver nanoparticles (AgNPs) released into the environment are subject to environmental transformation processes before accumulating in aquatic organisms and transferring along the food chain. Lack of understanding on how environmental transformation affects trophic transfer of AgNPs hinders accurate prediction of the environmental risks of these widely present nanomaterials . Here we discover that pristine AgNPs as well as their sulfidation products (Ag 2 S-NPs) and dissolution products (Ag + ) tend to be accumulated in Daphnia magna and subsequently transferred to zebrafish. In D . magna , Ag + exhibits the highest bioaccumulation potential whereas Ag 2 S-NPs show the lowest bioaccumulation. Surprisingly, the biomagnification factor of Ag + along the D . magna -zebrafish food chain appears to be significantly lower relative to AgNPs and Ag 2 S-NPs, likely due to the limited release of Ag from D . magna to zebrafish during digestion. Moreover, AgNPs and their transformation products mainly accumulate in the internal organs, particularly intestine, of zebrafish. Adsorption of AgNPs on the surface of the intestinal cell membrane mitigates depuration of AgNPs and, at least in part, leads to the larger biomagnification factor of AgNPs, relative to their transformation products. This research highlights the necessity of considering environmental transformation processes of nanomaterials in assessing their bioavailability and risk.
研究领域:
环境科学
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生态学
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毒理学
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2021
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IF 6.901
Ying Liu,Xuyun Lu,Zhangyu Ma,Ke Guo,Cong Guo,Min Han,Jianchun Bao
MoS 2 is an important electroactive material with attractive prospect for hydrogen evolution reaction (HER) application, but limited number of active sites and electronic conductivity greatly hinder the improvement of its electrocatalytic performances. This work reports an innovative MoS 2 /Ag 2 S nanohybrids (NHs) with Ag 2 S nanoparticles anchored onto the surface of MoS 2 nanoflowers . Particularly, the Ag 2 S herein demonstrates strong electronic coupling effect with the MoS 2 matrix while the MoS 2 shows dominant photothermal effect, which greatly improve the number of electrochemical active sites and reaction kinetics of the MoS 2 /Ag 2 S NHs, respectively. Thus when applied to HER, the MoS 2 /Ag 2 S NHs show remarkable overpotential at 10 mA cm −2 (138 mV), Tafel slope (72 mV dec −1 ) and exchange current density (1.6 mA cm −2 ) under the irradiation of 808 nm light, superior than that of the MoS 2 , Ag 2 S counterparts and MoS 2 /Ag 2 S NHs without light irradiation . Such a hetero-coupling and photothermal effects co-modulated design strategy provides a new avenue and an alternative catalyst to Pt for HER and other-energy related applications.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
NANOTECHNOLOGY
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2013
·Vol. 24
·期 35
·355602
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IF 3.842
Aiwei Tang,Yu Wang,Haihang Ye,Chao Zhou,Chunhe Yang,Xu Li,Hongshang Peng,Fujun Zhang,Yanbing Hou,Feng Teng
A one-step colloidal process has been adopted to prepare silver (Ag) and silver sulfide (Ag2S) nanocrystals, thus avoiding presynthesis of an organometallic precursor and the injection of a toxic phosphine agent. During the reaction, a layered intermediate compound is first formed, which then acts as a precursor, decomposing into the nanocrystals. The composition of the as-obtained products can be controlled by selective cleavage of S–C bonds or Ag–S bonds. Pure Ag2S nanocrystals can be obtained by directly heating silver acetate (Ag(OAc)) and n-dodecanethiol (DDT) at 200 ° C without any surfactant, and pure Ag nanocrystals can be synthesized successfully if the reaction temperature is reduced to 190 ° C and the amount of DDT is decreased to 1 ml in the presence of a non-coordinating organic solvent (1-octadecene, ODE). Otherwise, the mixture of Ag and Ag2S is obtained by directly heating Ag(OAc) in DDT by increasing the reaction temperature or in a mixture of DDT and ODE at 200 ° C. The formation mechanism has been discussed in detail in terms of selective S–C and Ag–S bond dissociation due to the nucleophilic attack of DDT and the lower bonding energy of Ag–S. Interestingly, some products can easily self-assemble into two- or three-dimensional (2D or 3D) highly ordered superlattice structures on a copper grid without any additional steps. The excess DDT plays a key role in the superlattice structure due to the bundling and interdigitation of the thiolate molecules adsorbed on the as-obtained nanocrystals.
研究领域:
材料科学
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纳米技术
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化学合成
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DOI
高影响因子
Frontiers of Environmental Science & Engineering
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2021
·Vol. 16
·期 2
·1-12
·
IF 4.357
Chen Wanpeng,Song Jiahui,Jiang Shaojie,He Qiang,Ma Jun,Huangfu Xiaoliu
Extracellular polymeric substances (EPS) in activated sludge from wastewater treatment plants (WWTPs) could affect interactions between nanoparticles and alter their migration behavior. The influence mechanisms of silver nanoparticles (Ag NPs) and silver sulfide nanoparticles (Ag 2 S NPs) aggregated by active EPS sludge were studied in monovalent or divalent cation solutions. The aggregation behaviors of the NPs without EPS followed the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The counterions aggravated the aggregation of both NPs, and the divalent cation had a strong neutralizing effect due to the decrease in electrostatic repulsive force. Through extended DLVO (EDLVO) model analysis, in NaNO 3 and low-concentration Ca(NO 3 ) 2 (< 10 mmol/L) solutions, EPS could alleviate the aggregation behaviors of Cit-Ag NPs and Ag 2 S NPs due to the enhancement of steric repulsive forces. At high concentrations of Ca(NO 3 ) 2 (10–100 mmol/L), exopolysaccharide macromolecules could promote the aggregation of Cit-Ag NPs and Ag 2 S NPs by interparticle bridging. As the final transformation form of Ag NPs in water environments, Ag 2 S NPs had better stability, possibly due to their small van der Waals forces and their strong steric repulsive forces. It is essential to elucidate the surface mechanisms between EPS and NPs to understand the different fates of metal-based and metal-sulfide NPs in WWTP systems.
研究领域:
环境科学
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纳米生物学
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DOI
高影响因子
Journal of Physical Chemistry C
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2025
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IF 3.2
Zhemin Wu,Jun Liu,Lu Chen,Hangsheng Yang,Yong Wang
Phase transformations govern material properties, enabling applications in medical devices, data storage, aerospace components, and more. However, the understanding and controlled manipulation of the phase microstructures during the reversible transformation remains incomplete due to the formation of diverse variants, particularly for nonmetallic materials. Here, using in situ transmission electron microscopy (TEM), we revealed that single-crystalline Ag2S could be controlled to expand and contract along the same direction during its phase transition cycles. This allows its orientation to be memorized, ascribed to the nonuniform distribution of Ag+ in a high-temperature body-centered cubic (BCC) phase of β-Ag2S, which is a fast-ion-conductor. Intriguingly, by controlling the Ag+ ion distribution in β-Ag2S, we are able to manipulate the orientation memory effect and accordingly to control the orientation and shape during phase transformation back to α-Ag2S, a typical semiconductor. These findings open the possibility for the development of unconventional shape memory material for multifunctional electronic devices.
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DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2025
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IF 3.5
Yuxin Shao,Chengwei Gao,Yanqing Fu,Shiliang Kang,Linling Tan,Baoan Song,Shixun Dai,Changgui Lin
Superionic β -Ag 2 S demonstrates exceptional ionic conductivity and ductility, rendering highly promising for applications in electrochemical sensors, thermoelectric devices and solid-state electrolytes. However, it is still haunted by the limited thermodynamic stability, transitioning to the poorly conductive α -Ag 2 S phase upon cooling to room temperature (RT). Herein, a solid solution formed by partial isovalent substitution of sulfur with tellurium stabilizes the superionic phase via the substantial atomic-size mismatch between S and Te. Specifically, Ag 2 S 1-x Te x (0.2 ≤ x ≤ 0.8) maintain superionic phase at RT without observable phase transition upon cooling. This stabilized superionic phase originates from the substantial size mismatched between S and Te. Furthermore, the anion disorder caused by the local volume expansion introduced by large-radius Te reduces the activation energy the activation energy barrier and provides more vacancies for Ag + ion transportation. This work confirms the efficiency of crystal amorphization strategy for stabilizing high-temperature superionic phases at ambient conditions, enabling the development of superionic conductors.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Yao Huang,Fengyu Tian,Leilei Sun,Chenhui Ji,Craig A. Grimes,Qingyun Cai
Accurate detection and localization of micrometastases are extremely important for tumor diagnosis and comprehensive treatment. However, it is clinically difficult to finely localize micrometastases, especially focal lesions smaller than 1 mm. To that purpose, this work designed a tumor microenvironment factor (glutathione, GSH)-activated second near-infrared transparency window (NIR-II) fluorescent probe for visualization of micrometastases. It is constructed by complexing copper ions with 3-mercaptopropionic acid-modified silver sulfide (Ag 2 S-MPA) quantum dots . The experimental results showed that the probe has good and stable GSH activation properties and can achieve tumor-specific NIR-II fluorescence imaging. Further, in vivo imaging experiments demonstrated that the probe can precisely localize melanomas with a diameter of < 0.1 mm in lung micrometastases. This work provides a potential strategy for the development of novel tools for localization and visualization of micrometastases.
研究领域:
肿瘤学
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医学影像学
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生物化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 30
·1965
·
IF 2.8
Wei Lianghuan,Dong Tianhao,Cui Yongpeng,Zhu Shengjie,Si Jianxiao
One potential application for flexible thermoelectric (TE) devices based on inorganic ductile fiber materials is the development of self-powered wearable electronics. In the work, the molten drawing method was employed for fabricating inorganic ductile Ag 2 S 0.7 Te 0.3 fibers. The output voltage and maximum output power of the single fiber are 3.3 mV and 837.4 nW, respectively, under a temperature difference of 50 K. The Ag 2 S 0.7 Te 0.3 fiber shows outstanding stability performance in the service stability test with a critical electric density of 36 A cm −2 and exhibits a tensile strain of 5%. The high temperature sensitivity of the Ag 2 S 0.7 Te 0.3 fibers TE device demonstrates the application potential in wearable electronics products.
研究领域:
材料科学
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纳米科技
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能源材料
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柔性电子学
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热电转换
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）