BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Xiaoru Zhang,Mingshuai Liu,Hongxia Liu,Shusheng Zhang
A new photoelectrochemical (PEC) biosensor was developed using low-toxic Ag 2 S QDs as photoelectrochemically active species. Energy levels of Ag 2 S and Ag 2 Se QD were compared to explain their differences in the PEC performance. The preparation condition of Ag 2 S QD was optimized and its structure characterization was measured. Then the developed photoelectric active interface was used to detect glucose and MCF-7 cancer cell and showed the good sensitivity and specificity. Under optimal condition, detection limits of 3.2×10 −5 M for glucose and 98 cells/mL for MCF-7 cell were achieved. Thus, the prepared Ag 2 S QD could serve as an excellent and promising photoelectric active material in the PEC biosensor.
研究领域:
生物传感技术
·
材料科学
·
医学诊断
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Hongtao Ren,Wence Xu,Shengli Zhu,Zhenduo Cui,Xianjin Yang,Akihisa Inoue
Nanoporous CuS and Ag 2 S/CuS composite are synthesized by chemical dealloying method. The Ag 2 S content of the composite catalysts is controlled by Ag atom in the original amorphous alloys. The composite catalysts reveal an good activity for hydrogen evolution reaction (HER) with a small potential of ∼0.2 V when current density is 10 mA cm −2 and a high current density of 163.4 mA cm −2 at 400 mV overpotential, which is associated with the enriched active sites on CuS and the improved electrical conductivity by Ag 2 S. The Tafel slope of Ag 2 S/CuS (75 mV dec −1 ) indicates that the combination of VH (Volmer-Heyrovsky) and VT (Volmer-Tafel) mechanisms might be involved to produce molecular hydrogen over Ag 2 S/CuS catalysts and the rate-determining step is likely some other than purely Heyrovsky or Tafel step. In addition, the composites exhibit good durability in acidic electrolytes and this method would open up a new type of highly efficient electrocatalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Pengjuan Ni,Yujing Sun,Haichao Dai,Jingting Hu,Shu Jiang,Yilin Wang,Zhen Li,Zhuang Li
In this work, a facile approach to sensitively detect sulfide ions is developed. The proposed method is based on the findings that silver ions could oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to induce a blue color and an absorption peak centered at 652 nm. The introduction of sulfide ions leads to the formation of Ag 2 S nanoparticles which act as catalyst to enhance the oxidation capacity of silver ions, resulting in a blue color burning and increase of the absorbance at 652 nm. Based on the above facts, a facile method is developed to qualitatively and quantitatively detect sulfide ions by naked eyes and UV–vis spectroscopy, respectively. The color changes of the detection system in the presence of nanomolar level of sulfide ions could be distinguished by naked-eyes, demonstrating the high sensitivity of the method. Highly sensitive detection of sulfide ions can be achieved in the range of 1.0 × 10 −9 M to 8.0 × 10 −8 M, with a detection limit of 0.2 nM. In addition, this method shows excellent selectivity toward sulfide ions detection and has been successfully applied to detect sulfide ions in tap water and lake water samples. Moreover, this method is simple without the preparation of nanomaterials and the need of complex readout instruments.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Kena Fu,Yupeng He,Bin Zhang,Xuwen Gao,Guizheng Zou
A convenient strategy to enhance the aqueous stability and radiative-charge-transfer of perovskite nanocrystals (PNCs) is developed via hybriding CsPbBr 3 PNCs with Ag 2 S nanoparticles , which is conducted by directly decomposing silver diethyldithiocarbamate in CsPbBr 3 PNCs crude. The obtained CsPbBr 3 -Ag 2 S hybrids are aqueous stable, and exhibit obviously enhanced aqueous photoluminescence (PL) with a quantum yield up to 82% in pure water as well as boosted electrochemical response for charge injection and 9-fold enhanced electrochemiluminescence (ECL) than CsPbBr 3 PNCs in aqueous electrolyte . Both PL and ECL spectra of CsPbBr 3 -Ag 2 S hybrids are almost identical to the PL spectrum of CsPbBr 3 PNCs, indicating radiative-charge-transfer within CsPbBr 3 -Ag 2 S hybrids only occurs in CsPbBr 3 segment. Annihilation ECL demonstrates that all the charges injected onto CsPbBr 3 -Ag 2 S hybrids at the redox potentials of Ag 2 S segment can be efficiently transferred into CsPbBr 3 segment to enhance radiative-charge-transfer. This strategy is promising for the application of PNCs as well as the developing of novel electrochemiluminophores.
研究领域:
材料科学
·
光学
·
电化学
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 9
·948
·
IF 3.52
Chen Zhao,Zhi Yu,Jun Xing,Yuting Zou,Huiwen Liu,Hao Zhang,Weili Yu,Hicham Idriss,Chunlei Guo
The development of efficient electrocatalyst to produce molecular hydrogen from water is receiving considerable attention, in an effort to decrease our reliance on fossil fuels. The prevention of the aggregation of active sites during material synthesis, in order to increase charge transport properties of electrocatalysts, is needed. We have designed, synthesized, and studied a Ag2S/reduced graphene oxide (rGO) electrochemical catalyst (for hydrogen evolution) from water. The Ag2S nanocrystals were synthesized by the solvothermal method in which the rGO was added. The addition of the rGO resulted in the formation of smaller Ag2S nanocrystals, which consequently increased the electrical conductivity of the composite catalyst. The composite catalyst showed a higher electrochemical catalytic activity than the one with an absence of rGO. At a current density of 10 mA/cm2, a low overpotential of 120 mV was obtained. A Tafel slope of 49.1 mV/dec suggests a Volmer–Herovsky mechanism for the composite catalyst. These results may provide a novel strategy for developing hydrogen evolution reaction (HER) electrocatalysts, via the combining of a nano-semiconductor catalyst with a 2D material.Keywords:HER;Ag2S nanocrystals;reduced graphene oxide (rGO);electrocatalyst;composites
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 4
·045508
·
IF 1.62
Fengpo Yan,Fugui Yang,Hao Zhang,Peihui Luo
Silver sulfide, cadmium sulfide and nickel (Ag2S/CdS/Ni) ternary nanostructures were fabricated by a two step process and characterized by x-ray powder diffraction, transmission electron microscopy, and UV–vis diffuse reflection spectroscopy. The photocatalytic hydrogen production activity of ternary nanostructures and reference samples were evaluated using triethanolamine (TEOA) as sacrificial reagent in water under visible-light illumination (λ ≥ 420 nm). The result shows Ag2S/CdS/Ni nanostructures exhibited a high visible light photocatalytic H2 evolution rate of 1.54 mmolh−1 g−1, which was 4.6 times and 1.4 times higher than that of 1.2% mol Ag2S/CdS and Ni/CdS. The degree of photocorrosion of CdS were employed to study the photogenerated carriers transfer route by measuring and comparing the concentration of Cd2+ in the solution of the photocorrosion experiments in a nonsacrificial system. A long-range electric field, which is similar to the p-i-n electric field structure, was proposed to be constructed by Ni nanoparticles and Ag2S nanoparticles in CdS. Most of the photogenerated electrons and holes in CdS drift to the electron donor and electron acceptor respectively under the action of long-range electric field, which greatly improves the separation efficiency of photogenerated carriers and the photocatalytic H2 production activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2024
·
IF 6.1
Ruofei Ma,Qi Zhang,Yue Wang,Zhangrun Xu
Much effort has been devoted to designing diverse photosensitizers for efficient photodynamic therapy (PDT) and photothermal therapy (PTT) performance. However, the effect of PS morphology on the PDT and PTT performance needs to be further explored. In this work, a photosensitizer, Au–Ag2S nanoparticles functionalized with indocyanine green, caspase-3 recognition peptides, and mitochondria-targeting peptides (AICM NPs) with different morphologies, including core–shell, eccentric core–shell-I, eccentric core–shell-II, and Janus morphologies, were synthesized to enhance PDT and PTT performance. Among them, AICM Janus NPs with enhanced charge-transfer efficiency and photothermal conversion demonstrate superior PDT and PTT performance compared to those of other morphologies. In addition, AICM NPs exhibit satisfactory surface-enhanced Raman scattering performance for in situ SERS monitoring of caspase-3 during PDT and PTT processes. After PDT and PTT treatment with AICM Janus NPs, the damaged mitochondria released caspase-3. AICM Janus NPs achieved a superior apoptosis rate in tumor cells in vitro. Furthermore, AICM Janus NPs treat the tumors in vivo within only 10 days, which is half the time reported in other work. The AICM NPs demonstrated superior therapeutic safety both in vitro and in vivo. This study investigates the effects of morphology-property-performance of photosensitizers on the PDT and PTT performances, which opens a new pathway toward designing photosensitizers for efficient PDT and PTT.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤治疗学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yunfan Lin,Donglin Han,Yuan Li,Lei Tan,Xiangmei Liu,Zhenduo Cui,Xianjin Yang,Zhaoyang Li,Yanqin Liang,Shengli Zhu,Shuilin Wu
On a global scale, bacterial infection has become a huge threat to human health. Taking into consideration the increasing drug-resistance bacteria, it is urgent to develop novel nonantibiotics strategies to kill bacteria rapidly. Herein, Ag2S@WS2 was developed as a new kind of antibacterial agent, where exfoliated WS2 nanosheets were decorated with Ag2S nanoparticles through in situ growth. Under near-infrared (NIR) light irradiation (808 nm), the tight contact between Ag2S and WS2 endowed the composite with outstanding photocatalytic property, which was attributed to effective separation of photoactivated electronics and holes. Because of the synergistic effect of photocatalytic and photothermal properties, highly effective antibacterial efficacy could be achieved for Ag2S@WS2 within 20 min NIR light irradiation, that is, 99.93% toward Staphylococcus aureus and 99.84% toward Escherichia coli. Moreover, the in vitro cell culture test showed that the synthesized Ag2S@WS2 was noncytotoxic. These results demonstrate that Ag2S@WS2 can be a promising material for rapid and highly effective disinfection under NIR irradiation.
研究领域:
材料科学
·
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Hongge Cao,Yuhang Wu,Ruicai Gao,Peijie He,Qiang Wu,Jixiang Cui,Longyan Gu,Tuo Cai,Ping Peng,Yan Lei,Yuan Lin,Zhi Zheng
Ag 2 S colloidal quantum dots (CQDs) are promising candidates for solution-processable and eco-friendly solar cell applications, but the power conversion efficiency is still far from its theoretical value (∼30 %). Where the migration of Ag ions in Ag 2 S CQDs may be responsible for this. In this work, to suppress the migration of Ag ions and further enhance the photoelectric properties of the Ag 2 S CQDs, Bi elements have been doped into the Ag 2 S CQDs via a facile route at low temperature. Without heat, the Bi content in the resulting Bi-doped Ag 2 S CQDs can be adjusted by adding raw BiI 3 in the reaction system. The photoelectric responsivity of Bi-doped Ag 2 S CQDs is about 6 times greater than that of the undoped Ag 2 S CQDs. Finally, solid-state solar cells have been constructed, and 1.5 % power conversion efficiency has been obtained. Current work may provide an avenue to produce high-quality Ag 2 S CQD-based photoelectric materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Liyun Lv,Jingjing Liu,Hong Wang
Ag 2 S hollow nanospheres were synthesized by reaction between silver dodecanoate and thiourea in the presence of polyvinyl pyrrolidone (PVP) at ambient temperature within 30 min. Characterization studies by X-ray powder diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed that the prepared product had a monoclinic structure and was composed of thin shell enwrapped hollow nanospheres. Their large band gap energy of 3.67 eV, remarkable blue shifts both in the ultraviolet-visible (UV–vis) absorption spectrum and the photoluminescence (PL) emission peak could be well explained by the thin shell caused quantum confinement effects.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 7
·5087-5092
·
IF 1.556
Zhao Yanmeng,Zhang Zhongping,Sun Dapeng,Li Guangqiang,Lan Xinzheng,Jiang Yang
We explored a facile routine to synthesize morphology-controlled Ag2S–CdS heterostructures. The heterostructures were achieved by a two-step method where CdS nanorods were prepared in the first step, acting as the substrates inducing successive cation exchange reaction
between Cd2+ and Ag+ ion. The nucleation sites of Ag2S can be readily controlled by varying the feed ratios of Ag+ to Cd2+ ion, thus leading to formation of heterostructures with different morphology where Ag2S particles grow
on the tips of the CdS rods, or at multiple locations across the nanorods. HRTEM analysis showed that Ag2S particles were grown on the varied sites of CdS rods with a coherent, quasi-epitaxial interface having different degrees of lattice mismatch. Photoluminescence results showed
that, compared to bare CdS nanorods, enhanced trap emissions were observed after the growth of Ag2S particles on the rods, which can be attributed to the strained interfaces instead of impurities doping.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Mingyang Xu,Helin Niu,Jinjing Huang,Jiming Song,Changjie Mao,Shengyi Zhang,Chengfeng Zhu,Changle Chen
Visible light photocatalysts have stimulated great research efforts. In this contribution, graphene-like Co 3 S 4 nanosheet/Ag 2 S nanocomposite was prepared using a simple method, and characterized by transmission electron microscopy, X-ray diffraction, and UV–Vis DRS, etc. The photocatalytic properties of the nanocomposite was evaluated by the photocatalytic degradation of Methylene blue (MB) and Methyl orange (MO) under visible light irradiation. The nanocomposite photocatalyst displays excellent stability and photocatalytic activity compared with pure Co 3 S 4 nanosheet or Ag 2 S nanoparticles. The superior photocatalytic properties were attributed to its unique structures, which could promote efficiently electron/hole separation and transportation.
研究领域:
材料科学
·
环境科学
✓ 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）