Small Methods
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2021
·Vol. 6
·期 1
·2100811
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IF 14.188
Hui Zhang,Youshen Wu,Peng Tang,Hongrui Zhu,Zhenhai Gan,Hu-Qin Zhang,Daocheng Wu
The thermal behavior of enzymes in nanoscale is of great significance to life phenomena. This nonequilibrium state real-time thermal behavior of enzymes at nanoscale cannot be accurately detected by existing methods. Herein, a novel method is developed for the detection of this thermal behavior. The enzyme-quantum dot (QD) conjugates can be obtained by chemically grafting temperature-sensitive amino-AgInS 2 QDs to the enzyme, where the QDs act as nanothermometers with a sensitivity of −2.82% °C −1 . Detecting the photoluminescence intensity changes of the enzyme-QD conjugates, the real-time thermal behavior of enzymes can be obtained. The enzyme-QD conjugates show a temperature difference as high as 6 °C above ambient temperature in nano-microregions with good reproducibility (maximum error of 4%) during catalysis, while solution temperature hardly changed. This method has a temperature resolution of ≈0.5 °C with a detection limit of 0.02 mg mL −1 of enzyme, and spatially ensured that the amino-AgInS 2 QDs are quantitatively bound to the enzyme; thus, it can accurately detect the exothermic behavior of the enzyme and can be extended to other organisms’ detection. This method has high sensitivity, good stability, and reliability, indicating its great potential application in investigating the thermal behavior of organisms in nanoscale and related life phenomena.
研究领域:
生物化学
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纳米技术
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生物物理学
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Kailian Zhang,Man Zhou,Kai Yang,Changlin Yu,Ping Mu,Zhenzhen Yu,Kangqiang Lu,Weiya Huang,Wenxin Dai
The low-usage of solar energy and the sluggish separation efficiency of the photogenerated electrons/holes pairs are the obstacles in the practical application of photocatalysts. The integration of upconversion and Z-scheme heterojunction is expected to break the barriers to achieve the efficient charge separation and broaden near-infrared light absorption . Herein, an effective indirect Z scheme AgInS 2 /In 2 S 3 heterostructure with carbon quantum dots (CQDs, as the electron conduction medium) and Lu 3 NbO 7 :Yb, Ho (as upconversion function) has been successfully synthesized. Consequently, the Lu 3 NbO 7 : Yb, Ho/CQDs/AgInS 2 /In 2 S 3 heterostructure exhibited superior photocatalytic activities for Cr(VI) reduction and H 2 O 2 production, reducing 99.9% of Cr(VI)(20 ppm, 15 min) and 78.5% of Cr(VI) (40 ppm, 30 min) with visible light irradiation as well as 94.0% of Cr(VI) (20 ppm, 39 min) under NIR light irradiation. Simultaneously, the heterostructure could generate 902.9 μM H 2 O 2 for 5 h under visible light irradiation. The intensive photocatalytic properties could primarily be attributed to the boosted light absorption capacity, the improved solar-to-energy conversion by the remarkable upconversion capacity of Lu 3 NbO 7 : Yb, Ho/CQDs and the faster charge transfer through a Z-schematic pathway. This work is anticipated to open a novel “window” for designing the efficient photocatalysts by coupling of Lu 3 NbO 7 : Yb, Ho and CQDs.
研究领域:
材料科学
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环境科学
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光化学
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纳米技术
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2016
·
IF 1.86
Min Lu,Xue Bai,Yijun Lin,Changyin Ji,Hua Wu,Cheng Ruan,Wenzhu Gao,Yiding Wang,Qiaoling Du
We here report a warm white light-emitting diode (WLED) by employing the red-emitting liquid layer of AgInS 2 /ZnS quantum dots (QDs) over the yellow-emitting YAG:Ce phosphor-based WLEDs. Compared to the commercial WLEDs, our liquid-type QD-WLEDs exhibit a color temperature of 3500 K and an improved color rendering index of 85. In addition, the experimental results indicate that the liquid structure warm white light device has a higher luminous efficiency of 72.1 lm/W and a better color stability against the extended working time in comparison to the solid-type QD-WLEDs.
研究领域:
光电子学
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材料科学
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纳米技术
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固态照明
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Weidong Xiang,Cuiping Xie,Jing Wang,Jiasong Zhong,Xiaojuan Liang,Hailong Yang,Le Luo,Zhaoping Chen
Silver indium sulfide (AIS) quantum dots (QDs) with different Ag/In molar ratios were synthesized via a hot-injection method. Intense photoluminescence (PL) originating from the donor–acceptor pair recombination were observed for all the samples and the emission peak blue-shifted from 739 to 632 nm, being similar to the behavior of the absorption onset as the Ag/In ratios decreased. The highest PL quantum yield (QY) of the obtained ternary AIS QDs was ca. 62% with an optimum ratio of Ag/In = 1/4. Compared with AIS QDs, when Zn ions were introduced, the absorption spectra of the obtained quaternary Ag–Zn–In–S QDs were blue-shifted, and their emission peaks moved to higher energies accordingly, showing a tunable emission from red to green by altering the band gap energy. In order to further study the electroluminescence (EL) as well as looking forward to the applications in the optoelectronic devices of the obtained highly luminescent nanoparticles, the colloidal AIS QDs were deposited as thin films to the sandwich-like structured QD-LED. The experimental results showed that the obtained EL device exhibited EL emission originated from QDs thin films by adjusting the turn on voltage, which is for the first time to realize EL of AIS QDs in such QD-LED.
研究领域:
材料科学
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光学工程
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纳米技术
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Minghua Li,Guohui Chen,Youmei Chen,Qin Zhu,Ya Yan,Lanxia Liu
Photocatalysis is widely regarded as one of the most promising and environmentally friendly approaches for formaldehyde elimination. Currently, there is an urgent need for highly efficient visible-light-driven photocatalysts. In this study, a graphite-hydroxylated multi-walled carbon nanotube (MWCNTs-OH)-modified AgInS₂ (AIS) composite, designated as MWCNTs-OH/AgInS 2 (MA), was successfully synthesized via a simple in situ low-temperature liquid-phase method. Compared to unmodified AIS, the 5 % MA composite exhibits enhanced visible-light absorption, accelerated electron transport, and significantly improved photogenerated electron-hole pair separation efficiency. Consequently, the 5 % MA demonstrates superior degradation activity for high-concentration formaldehyde (1710 ppm), achieving a degradation efficiency of 67 % after 2 h of visible-light irradiation. The incorporation of 5 % MWCNTs-OH enhances gaseous formaldehyde degradation efficiency by 28 %, regardless of whether a 420 nm cutoff filter is used. Additionally, the 5 % MA photocatalyst shows excellent recyclability and stability during prolonged photocatalytic tests. Mechanism studies based on spectroscopic, electrochemical, and active species analyses reveal the pathway for MA-mediated visible-light photocatalytic formaldehyde degradation. This work provides a practical strategy for designing efficient and environmentally benign photocatalysts for formaldehyde removal.
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Advanced Optical Materials
·
2026
·
IF 7.2
Ziwei Liu,Chunjian Li,Xiaobin Xie,Haiyan Li,Junjie Qin,Bohua Dong,Lixin Cao,Chenghui Xia
The synthesis of luminescent ternary AgInS 2 quantum dots (QDs) is typically constrained by slow reaction kinetics and uncontrolled defect formation, which compromise optical efficiency. Herein, a multi-ligand synergy strategy that enables ultrafast (30 s) cation exchange from Ag 2 S to AgInS 2 at room temperature is reported. Trioctylphosphine mediates rapid Ag + extraction and In 3+ coordination, while octylamine dynamically modulates the exchange kinetics. Crucially, 1-dodecanethiol passivates deleterious sulfur vacancies and promotes the formation of beneficial emissive defect complexes. Optical and compositional analyses collectively indicate that the luminescence likely originates from radiative recombination via donor–acceptor pairs (e.g., a silver vacancy and an indium-on-silver antisite defect), stabilized by the ligand shell. This cooperative mechanism achieves a 10 4 -fold kinetic acceleration and low-cost gram-scale production (<$63/mmol). After ZnS shelling, the QDs attain a photoluminescence quantum yield of 86% and yield luminescent solar concentrators with a power conversion efficiency of 2.86% and an optical efficiency of 8.85%. This work establishes a non-equilibrium synthesis paradigm that overcomes the traditional trade-off between speed and defect control in ternary chalcogenides.
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ACS Applied Materials & Interfaces
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2015
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IF 6.723
Xiaojiao Kang,Yanchun Yang,Lan Wang,Song Wei,Daocheng Pan
Cadmium-free and water-soluble AgInS2/ZnS core/shell quantum dots (QDs) with a cost of 2.5 $/g are synthesized in an electric pressure cooker. The QD powders with different Ag/In ratios exhibit bright yellow, orange, and orange-red luminescence under UV light. Their absolute photoluminescence quantum yields (PLQYs) can reach as high as 50.5, 57, and 52%, respectively. Because gelatin is used as the capping agent, the concentrated QDs/gelatin solution can be directly utilized as phosphor for the fabrication of white light-emitting diodes (LEDs) by a simple drop-drying process without the need of resin package. Warm-white LEDs are obtained by combining orange-emitting QDs with blue InGaN chip. As-fabricated warm-white LED exhibits a luminous efficacy of 39.85 lm/W, a correlated color temperature (CCT) of 2634 K and a color rendering index (CRI) of 71 at a drive current of 20 mA. Furthermore, the electroluminescence (EL) stability of LED device and thermal stability of as-prepared QDs are evaluated.
研究领域:
材料科学
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光学工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Junyang Chen,Chenenze Jiang,Genglong Chen,Rongting Qin,Kuan Sun,Zhicheng Xiong,Xingwu Yan
Gradient-bandgap photodetectors are promising for their superior carrier separation and broadband spectral sensitivity, enabled by the continuous band alignment within the device. However, the controlled formation of gradient bandgap structures in AgInS 2 (Se) is hindered by its rapid selenization, which readily leads to heavily selenized products and thus poor compositional gradation. To address this challenge, this study introduces a non-stoichiometric engineering strategy by precisely modulating the Ag/In ratio. Slightly reducing the Ag/In ratio effectively slows the selenization kinetics due to an increased reaction barrier and film densification, thereby suppressing Kirkendall effect-related defects and strengthening the built-in electric field and breakdown strength. This leads to a dramatic enhancement in the device's responsivity and response speed. The optimized AgInS 2 (Se) thin-film photodetector with Ag/In ratio = 0.9/1.1 achieves high responsivities of 13.64 A·W⁻¹ at 760 nm and 1.075 A·W⁻¹ at 1050 nm under a –2 V bias, with external quantum efficiencies reaching 2226% and 127%, respectively. The device also exhibits a 3 dB bandwidth of 0.33 MHz and fast response times of 0.79 μs (rise) and 3.18 μs (decay). This work offers a novel material design and process control strategy for the scalable fabrication of high-performance gradient-bandgap photodetectors.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 5
·1307-1315
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IF 6.641
Bin Zeng,Fei Chen,Zhenyang Liu,Zhongyuan Guan,Xu Li,Feng Teng,Aiwei Tang
Herein, we demonstrated a seed-mediated growth method for the synthesis of ternary AgInS2 (AIS) and quaternary Ag–In–Zn–S (AIZS) nanocrystals (NCs) by means of a partial cation exchange with In3+ and Zn2+ ions. Binary Ag2S NCs with different sizes were synthesized first, which then acted as the seeds to prepare different-sized AIS NCs through the incorporation of In3+. The formation mechanism of AIS NCs was studied in terms of the temporal evolution of the morphology and crystal structure, and the heterostructured Ag2S-AIS NCs were formed as intermediates during the growth process of AIS NCs. Variation in the Ag/In feeding ratios from 1 : 1 to 1 : 3 led to a broad tuning of the optical band gap and photoluminescence (PL) maximum of AIS NCs, in which very small-sized AIS NCs with a tetragonal phase were obtained. Subsequently, the incorporation of Zn2+ into AIS NCs resulted in the widening of the optical band gap and the shift of the PL maximum to higher energy with the enhancement of the absolute PL quantum yields (PLQYs). When the reaction temperature was increased, the PL emission maximum could be tuned from 2.04 to 2.33 eV and the absolute PLQYs could be tuned from 16% to 58%. Time-resolved PL spectroscopy was used to study the PL decay dynamics of the AIS and AIZS NCs, and the PL emission was related to the recombination of the surface-related states, intrinsic defects and donor–acceptor (D–A) pairs. The ternary and quaternary Ag-based semiconductor NCs have long-lived excitons, which may have promising applications in the field of energy conversion.
研究领域:
材料科学
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纳米技术
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光学
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 7
·073512
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IF 4.386
Shihan Qi,Zhuangzhuang Yin,Shangkun Deng,Chunsheng Ding,Peng Chen,Ziliang Li,Wei Gan,Jun Guo,Miao Zhang,Zhaoqi Sun
In this work, Ag quantum dot-modified AgInS2/In2S3/TNR nanoarray photocatalysts were prepared by a secondary hydrothermal and wet chemical method. Compared with the unmodified TNR arrays, the modified Ag-AgInS2/In2S3/TNR samples showed a significant increase in light absorption and could utilize more solar energy. In addition, the Ag-AgInS2/In2S3/TNR samples can effectively promote the separation and transfer of electron-hole pairs to enhance the photoelectrochemical and photocatalytic performance of the composites, and the degradation rate of the optimal Ag-AgInS2/In2S3/TNR samples can reach 95.73% for TC-HCl, which is of great importance for environmental protection. The main reasons for the enhanced catalytic performance are: the presence of surface Ag quantum dots and AgInS2 sensitizers greatly increases the absorption of sunlight, allowing more energy to enter the catalytic system; the stepped energy level arrangement of AgInS2/In2S3/TNR nanoarrays can spatially separate electrons and holes, improving the separation efficiency and enhancing the overall performance of the material.
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
OPTICAL MATERIALS
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2026
·
IF 4.2
Jie Chen,Lijiao Sun,Xiaoyun Pu,Kezhen Qi,Ya Yan
Water-soluble ZnS-coated AgInS 2 quantum dots (AIS/ZnS QDs) were synthesized via a one-pot aqueous method, and their crystal structure, surface composition, morphology and optical properties were systematically characterized. Based on the fluorescence quenching effect of AIS/ZnS QDs toward oxytetracycline (OTC), a fluorescence spectrophotometric method was established for OTC detection in milk. Under optimal conditions (QDs preparation at pH 5.5, detection temperature of 20 °C, and detection concentration of 0.160 g/L, with a 25 min reaction time), the relative fluorescence quenching degree (ΔF/F 0 ) showed a good linear correlation with logC (OTC concentration), with a linear equation of ΔF/F 0 = 0.2933 logC + 2.3388 (R 2 = 0.9984), a linear range of 1.22 × 10 -8 to 2.5 × 10 -5 mol/L and a detection limit of 1.82 × 10 -9 mol/L. The spiked recoveries of OTC in milk were 96.9%-107.1%. Furthermore, the possible quenching mechanism was proposed. This work offers insights into AIS-based functional material synthesis and expands their applications in fluorescence analysis.
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高影响因子
MICROCHEMICAL JOURNAL
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2026
·
IF 5.2
Rui Xu,Qin Wei,Dan Li
A self-powered PEC sensor was developed for sensitivity glyphosate detection. • Cs 3 BiBr 6 -AgInS 2 was used as photoanode to provide photo electrons transmission. • CuBi 2 O 4 used as photocathode for providing electric energy for target detection. • The proposed glyphosate sensor showed a wide linear range of 1 × 10 −10 - 5 × 10 −4 mol/L. A self-powered photoelectrochemical (PEC) sensor was developed for the ultrasensitive and rapid detection of glyphosate, a widely used herbicide and potential contaminant in fruits and vegetables. The sensor integrates a Cs 3 BiBr 6 /AgInS 2 composite photoanode with a CuBi 2 O 4 -based photocathode. As a lead-free halide perovskite, Cs 3 BiBr 6 exhibits broad light absorption and prolonged carrier lifetime, while AgInS 2 modification markedly enhances the photoelectric conversion efficiency and optical stability of the photoanode. Meanwhile, CuBi 2 O 4 possesses excellent biocompatibility and abundant active sites, enabling efficient aptamer immobilization for the selective recognition of glyphosate. Under optimized conditions, the photocurrent response decreased linearly with increasing glyphosate concentrations over the range of 1.0 × 10 −10 –5.0 × 10 −4 mol/L, with a low limit of detection (LOD) of 4.6 × 10 −11 mol/L. In addition, the proposed PEC sensor demonstrated excellent stability, reproducibility, and accuracy in the analysis of real food samples, including soybean and corn, highlighting its considerable potential as a reliable analytical platform for on-site monitoring of pesticide residues in agricultural products. Download: Download high-res image (144KB) Download: Download full-size image
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危险品化学品经营许可证（带存储）