ANALYTICAL CHEMISTRY
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2019
·
IF 6.35
Caiping Ding,Shasha Cheng,Cuiling Zhang,Youran Xiong,Mingqiang Ye,Yuezhong Xian
A luminescence resonance energy transfer (LRET) system was successfully developed using near-infrared (NIR) Ag2S nanodots (NDs) as the energy acceptors and upconversion nanoparticles (UCNPs) as the energy donors. The system possessing the properties of NIR excitation (980 nm) and NIR emission (795 nm) was used for the ratiometric detection and bioimaging of pH in tumor cells and zebrafish. Glutathione and mercaptopropionic acid (MPA) co-modified Ag2S NDs (GM-Ag2S NDs) were prepared by ligand exchange with an excellent pH-responsive property over a pH range of 4.0 to 9.0. The NIR GM-Ag2S NDs were covalently grafted with silica coated UCNPs, and an efficient LRET platform was developed via modulation of the thickness of the silica coating. Due to the LRET process between UCNPs and GM-Ag2S NDs, a ratiometric luminescence nanoprobe with the properties of NIR excitation–NIR emission was constructed for pH biosensing and bioimaging. On the basis of high contrast bioimaging, the nanoplatform can distinguish between tumor and normal tissue in the zebrafish model.
研究领域:
纳米技术
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生物医学工程
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分析化学
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生物成像
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Meixin Li,Pengfei Yu,Shanshan Li,Mati Ullah Khan,Shun Wang,Jiaqi Tian,Shuang Liu,Ling Kong,Zhiwei Chen
Aflatoxin B 1 (AFB 1 ) and ochratoxin A (OTA) are highly toxic mycotoxins prevalent in food and feed, posing severe threats to human and animal health. This work presents an innovative photoelectrochemical aptamer sensor for the detection of AFB 1 and OTA, leveraging a ternary BiOBr/Bi/BiOI heterojunction and Ag 2 S quantum dot-mediated signal amplification. The BiOBr/Bi/BiOI composite was synthesized via a one-step hydrothermal reduction using l -ascorbic acid (AA), exhibiting a high specific surface area to enhance biorecognition efficiency. In situ-assembled Ag 2 S quantum dots amplified photocurrent responses, while a single aptamer probe enabled specific dual-target recognition. Under optimized conditions, the sensor achieved exceptional sensitivity: linear ranges of 0.001–100 ng·mL −1 for both mycotoxins, with detection limits of 4.34 fg·mL −1 (AFB 1 ) and 13.54 fg·mL −1 (OTA). Validation in complex food matrices confirmed high accuracy and robustness. This platform not only provides a reliable method for mycotoxin monitoring but also establishes a versatile design paradigm for multiplexed detection of food contaminants.
研究领域:
分析化学
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食品科学
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生物传感器
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纳米技术
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环境监测
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产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Jieyu Zhang,Jingjing Min,Binghan Li,Wenxing Yang,Zaiping Zeng,Dianyi Liu,Botao Ji
Environmentally friendly Ag2S nanocrystals (NCs) show potential applications as light-absorbing semiconductors for thin-film photovoltaics or biological taggants. However, thiol ligands are generally involved during the synthesis of Ag2S NCs to maintain colloidal stability, hindering postexchange of these crystal-bound thiolate ligands. Here, using common non-thiol ligands (oleic acid and oleylamine), we develop a general strategy of surface heterovalent-metal (Bi3+, Ga3+, In3+, Sb3+, and Zn2+) decoration to synthesize colloidal cation-rich Ag2S NCs achieving a high photoluminescence quantum yield up to 22% at ∼1230 nm. Density functional theory calculations reveal the heterovalent-metal cations exhibit stronger orbital coupling to the ligands than Ag atoms, and thus stronger binding affinity, resulting in reduced dynamic surface ligands to produce compact cation-rich Ag2S NCs with high solubility in nonpolar solvents. We further show that surface-decorated Bi atoms can accumulate the electron charge density, leading to surface-related band-edge emissions with increased electron–hole separation and prolonged exciton lifetimes of the Bi-decorated Ag2S NCs, which are desirable for many optoelectronic conversion applications. Using a 40 nm-thick light-absorbing layer of Bi-decorated Ag2S NCs, the optimized solar cells show a short-circuit current density of 18.6 mA cm–2 and a power conversion efficiency of over 4%.
研究领域:
材料科学
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纳米技术
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光伏技术
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光电技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Ziliang Zheng,Rong Dai,Zhuo Jia,Xiaorong Yang,Yufei Qin,Shuo Rong,Xiaoyang Peng,Xianmei Xie,Yanyan Wang,Ruiping Zhang
Stimuli-responsive silica nanoparticles are an attractive therapeutic agent for effective tumor ablation, but the responsiveness of silica nanoagents is limited by intrastimulation level and silica framework structure. Herein, a biodegradable hollow SiO2-based nanosystem (Ag2S-GOx@BHS NYs) is developed by a novel one-step dual-template (bovine serum albumin (BSA) and cetyltrimethylammonium bromide (CTAB)) synthetic strategy for image-guided therapy. The Ag2S-GOx@BHS NYs can be specifically activated in the tumor microenvironment via a self-feedback mechanism to achieve reactive oxygen species (ROS)-induced multistep therapy. In response to the inherent acidity and H2O2 at the tumor sites, Ag2S-GOx@BHS would accelerate the structural degradation while releasing glucose oxidase (GOx), which could efficiently deplete intratumoral glucose to copious amounts of gluconic acid and H2O2. More importantly, the sufficient H2O2 not only acts as a reactant to generate Ag+ from Ag2S for metal-ion therapy and improves the oxidative stress but also combines with gluconic acid results in the self-accelerating degradation process. Moreover, the released Ag2S nanoparticles can help the Ag2S-GOx@BHS NYs realize the second near-infrared window fluorescence (NIR-II FL) and photoacoustic (PA) imaging-guided precise photothermal therapy (PTT). Taken together, the development of a self-feedback nanosystem may open up a new dimension for a highly effective multistep tumor therapy.
研究领域:
纳米技术
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癌症治疗
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材料科学
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生物医学工程
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诊疗学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Ziying Yuan,Yongyong Cao,Yue Meng,Guoxiang Pan,Yifan Zheng,Zheming Ni,Shengjie Xia
The built-in electric field of heterojunction can effectively promote carrier separation and transfer. While, its interface orientation is often random, leading to lattice mismatch and high resistance, thus limiting the efficiency of interfacial charge transfer. Herein, the lattice-matched heterojunction (CdS-Ag 2 S) was constructed by ion-exchange epitaxial growth . The results of surface photovoltage spectroscopy (SPV), transient photovoltage spectroscopy (TPV), and time-resolved photoluminescence (TRPL) show that the lattice-matched heterojunction has higher charge separation efficiency and longer photogenerated carrier lifetime than that of lattice-mismatched one. The lattice-matched CdS-Ag 2 S has a high built-in electric field (BIEF) value of 103.42 and a bulk-charge separation (BCS) efficiency of 68.71%, which is about three times higher than that of the lattice-mismatched heterojunction (CdS-Ag 2 S-M). In addition, the photodegradation efficiency of CdS-Ag 2 S towards norfloxacin (NOR) was also 3.4 times higher than that of CdS-Ag 2 S-M. The above results and density functional theory (DFT) calculations indicate that improving the lattice matching at the heterojunction is beneficial for establishing a high-intensity built-in electric field and effectively promoting bulk-charge separation efficiency, thus achieving excellent photocatalytic performance. This work provides an essential reference for the research of high-performance heterojunction photocatalysts.
研究领域:
材料科学
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光催化
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化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-13
·
IF 6.408
Gao Minjie,Han Zehua,Wang Zhihua,Zou Xueyan,Peng Lichao,Zhao Yanbao,Sun Lei
A novel near-infrared (NIR) light-triggered smart nanoplatform has been developed for cancer targeting and imaging-guided combined photothermal-chemo treatment. Notably, Ag 2 S has a dual function of photothermal therapy and fluorescence imaging, which greatly simplifies the structure of the system. It can emit fluorescence at 820 nm under an excitation wavelength of 560 nm. The phase-change molecule of 1-tetradecanol (TD) is introduced as a temperature-sensitive gatekeeper to provide the nanocarrier with controlled release capability of doxorubicin (DOX). The nanocarrier (HAg 2 S@mSiO 2 -TD/DOX) shows a high drug loading capacity of 26.3% and exhibits an apparent NIR-responsive DOX release property. Under NIR irradiation, the photothermal effect of HAg 2 S nanocores facilitated the release of DOX through the melting of TD. The cytotoxicity test shows that the nanocarriers have good biocompatibility. As the same time, the synergistic combination leads to a better cancer inhibition effect than individual therapy alone in vitro. Cell uptake tests indicate that the carriers have excellent fluorescence imaging ability and high cellular uptake for HepG2 cells. This work provides a new strategy for the fabrication of smart nanocarriers with simple structures for fluorescence-mediated combination cancer therapy. Graphical abstract Fabrication of a smart drug delivery system based on hollow Ag 2 S@mSiO 2 nanoparticles for fluorescence-guided synergistic photothermal chemotherapy
研究领域:
纳米技术
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癌症治疗
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药物递送系统
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光热疗法
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荧光成像
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Photonics Research
·
2020
·Vol. 8
·期 4
·548-563
·
IF 6.099
Bin Wang,Chen Zhao,Huanyu Lu,Tingting Zou,Subhash C. Singh,Zhi Yu,Chaonan Yao,Xin Zheng,Jun Xing,Yuting Zou,Cunzhu Tong,Weili Yu,Bo Zhao,Chunlei Guo
Localized surface plasmon resonance (LSPR) of nanostructures and the interfacial charge transfer (CT) of semiconductor materials play essential roles in the study of optical and photoelectronic properties. In this paper, a composite substrate of Ag2S quantum dots (QDs) coated plasmonic Au bowtie nanoantenna (BNA) arrays with a metal–insulator–metal (MIM) configuration was built to study the synergistic effect of LSPR and interfacial CT using surface-enhanced Raman scattering (SERS) in the near-infrared (NIR) region. The Au BNA array structure with a large enhancement of the localized electric field (E-field) strongly enhanced the Raman signal of adsorbed p-aminothiophenol (PATP) probe molecules. Meanwhile, the broad enhanced spectral region was achieved owing to the coupling of LSPR. The as-prepared Au BNA array structure facilitated enhancements of the excitation as well as the emission of Raman signal simultaneously, which was established by finite-difference time-domain simulation. Moreover, Ag2S semiconductor QDs were introduced into the BNA/PATP system to further enhance Raman signals, which benefited from the interfacial CT resonance in the BNA/Ag2S-QDs/PATP system. As a result, the Raman signals of PATP in the BNA/Ag2S-QDs/PATP system were strongly enhanced under 785 nm laser excitation due to the synergistic effect of E-field enhancement and interfacial CT. Furthermore, the SERS polarization dependence effects of the BNA/Ag2S-QDs/PATP system were also investigated. The SERS spectra indicated that the polarization dependence of the substrate increased with decreasing polarization angles (θpola) of excitation from p-polarized (θpola=90°) excitation to s-polarized (θpola=0°) excitation. This study provides a strategy using the synergistic effect of interfacial CT and E-field enhancement for SERS applications and provides a guidance for the development of SERS study on semiconductor QD-based plasmonic substrates, and can be further extended to other material-nanostructure systems for various optoelectronic and sensing applications.
研究领域:
光学
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光子学
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材料科学
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纳米技术
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光谱学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Busaremu Wulayimujiang,Fang Guo,Qianyu Ma,Yong Wen,Yang Yang,Hongyan Huang,Quanpei Xie,Meng Shen,Jinxin Liu,Si Cheng
Even though membrane separation materials have worked very well for purifying dyestuff wastewater, the short residence time and high pollutant flow rates in the membrane, which can lead to incomplete or insufficient photodegradation, make it currently difficult to separate and photodegrade large-scale or highly concentrated dyestuff wastewater in one step. Herein, we propose an ‘all-in-one’ 3D nanofibrous aerogel architecture (aPAN/MXene@Ag–Ag2S), which can achieve efficient purification of high-concentration dyeing effluents under natural sunlight via two methods: filtration or solar interfacial evaporation. Ag–Ag2S nanoparticles with two different structures are reduced on Ti3C2Tx nanosheets through a UV light-induced in situ reaction, and they function as effective photocatalysts with excellent photothermal ability for solar interfacial evaporation. The special combination of Ag–Ag2S, MXene, and aPAN nanofibers in the aPAN/MXene@Ag–Ag2S aerogels achieved 95% separation and 99.99% photocatalytic degradation efficiencies for oil/water emulsions with methylene blue at a high concentration of 1000 mg L−1, which far exceeds those of recently reported MXene-based catalysts. In particular, wastewater from industrial dyeing could be treated to clean water under natural sunlight. In addition, the evaporation rates of the aPAN/MXene@Ag–Ag2S aerogel for seawater and textile dye wastewater respectively reach 2.69 kg m−2 h−1 and 2.44 kg m−2 h−1 and almost 100% degradation efficiency is achieved. Both the filtered fresh water and the evaporated water produced by solar evaporation meet the requirements of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant or the World Health Organization (WHO) and the US Environmental Protection Agency (EPA) standards for drinking water, respectively.
研究领域:
环境科学
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材料科学
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水处理
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光催化
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Xiaokai Sun,Canguo Li,Qiying Zhu,Haowei Huang,Wei Jing,Zhiwei Chen,Ling Kong,Lei Han,Jun Wang,Yueyun Li
Food allergies have become a nonnegligible food safety issue, and milk allergies are one of the most common food allergies, that has attracted large consumer attention. In this work, a novel label-free photoelectrochemical (PEC) immunosensor for the detection of the allergen β-lactoglobulin (β-LG) in dairy products was designed that used the specific recognition of allergen β-LG and antibodies in dairy products in combination with biosensing technology . Here, Ag 2 S-sensitized spindle-shaped BiVO 4 /BiOBr heterojunction was fixed on the surface of the ITO electrode as an excellent photoactive substrate and effectively improved the photocurrent responses and sensitivity. Thioglycolic acid (TGA) was used as a linker to immobilize the β-LG antibody on the surface of the electrode. The photocurrent was detected at different antigen concentrations, which realized the quantitative testing of β-LG. Under the optimal experimental conditions, the PEC immunosensor proved an ideal linear relationship ranging from 10 pg/mL to 100 ng/mL, with a low detection limit of 3.7 pg/mL. The designed immunosensor showed good stability, a wide linear range, high sensitivity and good reproducibility and could be used for the detection of actual samples. The PEC immunosensor had a strong ability to specifically recognize β-LG, which was not affected by other proteins in the milk without pretreatment . Meanwhile, the developed immunosensor provided a promising PEC detection platform and reference idea for the detection of other proteins in milk.
研究领域:
食品科学
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分析化学
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生物传感器
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免疫学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2025
·
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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产品关联
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Yinqing Zhang,Kunkun Wang,Yi Yang,Jinliang Xu,Binbin Sun,Lingyan Zhu
Silver nanowires (AgNWs) are widely produced in many electronic and optical products, and could be inevitably discharged into the aquatic environments. Sulfidation is one of the most important transformation processes of AgNWs, and could significantly affect their fate and interactions with other pollutants in aquatic environment. In the present study, the sulfidation products of AgNWs with different atomic ratio of Ag and S were prepared under environmentally relevant conditions. The crystal structure, elemental composition, morphology and size of the sulfidation products were comprehensively characterized by powder X-ray diffraction, UV–vis spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscope . The products were heterostructured nanowires and the Ag 2 S/Ag molar ratio increased with extension of the reaction time. The produced Ag 2 S–Ag nanowires displayed a good photocatalytic activity and facilitated the degradation of the copresent organic pollutant bisphenol A (BPA) under simulated sunlight irradiation. As sulfidation time increased, more Ag 2 S was generated and the Ag 2 S–Ag composites displayed high promotion effect on BPA degradation. This effect could be ascribed to the favorable synergistic effects between Ag 2 S and AgNWs, such as high electron-hole separation efficiency and low charge transfer resistance. The chemical scavenger experiments demonstrated that superoxide anion radicals and photogenerated holes in the sulfidation products of AgNWs could be the main reactive species for photocatalytic degradation .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19
Weiwei Dong,Junjie Fu,Zhengqing Wang,You Sun,Jing Zhang,Jiajing Chu,Tianhui Li,Jin Yang,Ke Wang,Dandan Zhao,Yange Zhang,Zhi Zheng
Silver sulfide (Ag 2 S) is an excellent photovoltaic material due to its optimal elemental composition and strong chemical and device stability. A critical factor limiting the further efficiency enhancement of Ag 2 S solar cells lies in the severe carrier recombination losses at the Ag 2 S/ITO back interface, primarily attributed to poor electrical contact and energy barrier mismatch between the absorption layer and ITO electrode. Herein, we propose a novel back-interface optimization strategy by introducing a Zn-doped SnO 2 (SnO 2 :Zn) electron transport layer (ETL) at the rear contact of Ag 2 S. The SnO 2 :Zn ETL demonstrates dual-functionality in Ag 2 S devices: reducing interfacial energy barriers and inducing a transition in the preferred crystalline orientation of the absorption layer from (012) to ( 1 ¯ 03 ) $( {\bar 103} )$ Furthermore, the formed Zn Sn acceptor defect and V O vacancy defects within SnO 2 :Zn synergistically decrease electron concentration, raise the work function, and thus establish a favorable back-surface field. These coordinated mechanisms collectively improve charge carrier extraction and suppress non-radiative carrier recombination. Consequently, the power conversion efficiency of SnO 2 :Zn incorporated Ag 2 S devices is elevated from 1.91% to 2.76%. This innovative strategy provides novel insights into interface engineering for Ag 2 S thin-film solar cells.
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DOI
高影响因子
危险品化学品经营许可证（带存储）