Nanoscale
·
2024
·Vol. 16
·期 28
·13654-13662
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IF 5.8
Naiwei Wei,Hong Zhu,Danni Yan,Shuai Yang,Lili Xu,Shengli Zhang,Yuhui Dong,Yousheng Zou,Haibo Zeng
I–III–VI quantum dots (QDs) have gained widespread attention owing to their significant advantages of non-toxicity, large structural tolerance, and efficient photoluminescence potential. However, the disbalance of reactivity between the elements will result in undesired products and compromised optical properties. Reducing the activity of highly reactive group IB elements is the most common approach, but it will reduce the overall reactivity and lead to a wide dispersion of QD sizes. In this study, we propose a method to improve the overall reactivity of the reaction system using the highly active IIIA precursor InI3, which triggers rapid nucleation and promotes the formation of Ag(In,Ga)S2 (AIGS) QDs, resulting in monodisperse particle size distributions and a significantly improved photoluminescence quantum yield (PLQY) (from 12% to 72%). Furthermore, narrow band edge emission is realized by coating a gallium sulfide (GaSx) shell on the basis of obtaining high-quality AIGS QDs. The core/shell QDs exhibit a 90% PLQY with a full width at half maximum (FWHM) of only 31 nm at 530 nm. This study provides a viable design strategy to synthesize monodisperse AIGS QDs with a narrow peak width and efficient luminescence, promoting the application of AIGS QDs in the field of luminescent displays.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Keduo Yan,Lan Xu,Adnan Ahmed
Due to the rapid development of information technology and the trend toward miniaturization of electronic equipment, the research on electromagnetic interference (EMI) shielding materials is rapidly moving toward low-dimensional, core–shell, and lightweight directions, with a wide range of application prospects in various fields. In this study, using pDA as a binder, poly(vinylidene difluoride) (PVDF)/Fe3O4@pDA@Ag nanofiber membranes (NFMs) with a multicore–shell structure were prepared by in situ growth of Ag nanoparticle (NP) layers on the fiber surface of electrospun PVDF/Fe3O4 NFMs fabricated in batch. Compared to PVDF@pDA@Ag NFM, the average EMI shielding efficiency (SE) of PVDF/Fe3O4@pDA@Ag NFM reached 82.31 dB because of the increased hysteresis and multireflection losses inside the NFM caused by the moderate addition of Fe3O4 NPs. In addition, the synergistic effect of Fe3O4 and Ag NPs increased the microwave attenuation and impedance matching of composite NFM, further enhancing its EMI SE.
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MATERIALS SCIENCE & ENGINEERING R-REPORTS
·
2025
·
IF 26.8
Song Luo,Xiaohe Tian,Li Pan,Runhua Zhou,Shunda Zhu,Zuyi Yan,Kui Rao,Bo Liu,Shaofei Wang,Hong Wu
With the increasing severity of urban heat islands, personal thermal management (PTM) has emerged as a critical solution for maintaining human thermophysiological comfort in dynamic environments. Traditional air conditioning systems are energy-intensive and lack individualized control, highlighting the need for efficient, low-energy PTM strategies. Current PTM materials often operate in static modes, limiting their adaptability to varying conditions. To overcome this, we developed a Janus-structured humidity-photothermal actuator (TpPa-SO₃H/Ag@M) by integrating a TpPa-SO₃H covalent organic framework (COF) for rapid water transport and a silver nanoparticle (AgNP)-intercalated MXene (Ag@M) for humidity gradient formation and enhanced photothermal conversion. The COF layer facilitates moisture accumulation, while the Ag@M laminar structure delays water diffusion, enabling a sensitive humidity response. AgNPs expand the MXene interlayer spacing, improving water uptake and response efficiency by triple compared to initial TpPa-SO₃H/MXene systems, while also preventing structural collapse during cycling. Additionally, AgNPs enables strong solar absorption, boosting photothermal performance. Under combined humidity and light stimulation, the Janus actuator exhibits dynamic bending, enabling autonomous sweat evaporation and body temperature regulation without external energy input. This dual-responsive design offers a promising approach for adaptive, energy-efficient PTM in extreme environments.
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IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Jingxuan Wu,Yu Wan,Zhenxing Wang,Yimu Wang,Qingsong Luo,Changhao Feng,Tatsuo Yoshinobu
The efficient and reliable monitoring of acetic acid (CH3COOH) is significant to environmental protection and human healthcare. LaFeO3 is a potential sensing material for CH3COOH with its good sensitivity and high plasticity. To further improve the sensing properties of LaFeO3 to meet the requirements of applications, we successfully utilized the facile electrospinning technique to fabricate a series of CH3COOH-sensitive Ag-doped (0–5 mol%) LaFeO3 nanotubes. The systematic characterization shows that the appropriate content (4 mol%) of Ag doping can effectively ameliorate the material morphology to realize loose porous structures. Meanwhile, the sensitization effect of Ag and ameliorated morphology significantly enhance the gas-sensing properties of LaFeO3 to CH3COOH vapor. The optimal Ag-doped LaFeO3 (4 mol%) loose nanotubes-based gas sensor results in a detection limit of 0.5 ppm and 3.6-fold enhancement of the response to 100-ppm CH3COOH compared with the pure LaFeO3 compact nanotubes at a low operating temperature (150 °C). It also exhibits excellent selectivity to CH3COOH and good long-term stability. Therefore, Ag-doped LaFeO3 can be regarded as a promising material for sensing CH3COOH in practical applications. Finally, the mechanism of enhanced gas-sensing properties is discussed.
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ANALYST
·
2012
·Vol. 137
·期 19
·4516-4523
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IF 4.23
Xun Yuan,Yi Chen
A new strategy was explored for the visual determination of Cu2+ using copper-catalysed in situ formation of Ag nanoparticles. In this method, only common reagents were used and the pre-synthesis and modification of nanoparticles are avoided. Ag+ can form a milk-white suspension (AgBr) with Br− in an aqueous solution composed of AgNO3, cetyltrimethylammonium bromide, ascorbic acid, bovine serum albumin, and NaNO3. The reaction will be stopped by addition of Cu2+, accompanied by a colour change from milk-white to orange or brilliant yellow. Cu+ (the reduction product of Cu2+) consumes the dissolved O2 and prevents the O2 from oxidizing the newly reduced Ag atoms (by ascorbic acid) back to Ag+, facilitating the further aggregation of Ag atoms to become Ag nanoparticles. The visible colour change was shown to be specific towards Cu2+ over most other metal ions. The limit of detection was 0.75 μM Cu2+ by the naked eye and 0.25 μM by spectrometer. Quantitation of Cu2+ was achieved in a linear range from 0.25 to 2.0 μM. This method was validated by measuring real water and serum samples, giving results agreeing well with the data reported and measured by inductively coupled plasma mass spectrometry. The recovery was 95.6–106% for untreated tap water and 96.0–100% for resin-pre-treated water and serum samples.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Tian Xing,Jiawei Wang,Jiayu Zhang,Hao Liu,Lijie Xu,Wen Zhang,Ruijin Hong,Chunxian Tao,Qi Wang,Hui Lin,Zhaoxia Han,Dawei Zhang
Ag 2 O-Ag/CH 3 NH 3 PbBr 3 (MAPbBr 3 ) heterojunction composites were synthesized using a strategy that combines one-step spin coating, electron beam evaporation, and laser irradiation. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses confirmed the formation of dense and uniform nanoparticles on the sample surface after laser irradiation, as well as the successful introduction of oxygen vacancies. These nanostructures and oxygen defects contribute to the emergence of a broad plasmonic resonance absorption peak and enhance the local electromagnetic field intensity, thereby promoting stronger nonlinear optical effects. Z -scan results show that the Ag 2 O-Ag/MAPbBr 3 heterojunction composites exhibit strong saturable absorption (SA), in contrast to monolayer Ag 2 O–Ag or MAPbBr 3 , due to efficient interfacial charge transfer that suppresses reverse saturable absorption (RSA) arising from excited-state absorption and multiphoton absorption. The nonlinear optical absorption was effectively tuned by laser irradiation with different pulse widths. The maximum third-order nonlinear absorption coefficient of the heterojunction was measured to be −7.96 × 10 −7 cm/W. In addition, the finite-difference time-domain (FDTD) simulation results were in good agreement with the experimental data. These results indicate that the as-synthesized Ag 2 O-Ag/MAPbBr 3 heterojunction composites have promising potential for applications in nonlinear optical devices.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2025
·
IF 3.2
Hexing Ren,Yaxin Wang,Jiahong Wen,Fan Zhang,Chengxuan Tang,Xiqiang Zhong,Yongjun Zhang,Yuxia Wang,Renxian Gao,Kun Zhang,Fengyi Zhang,Rufei Cui,Xiaoyu Zhao
Nanosphere lithography enables tunable fabrication of Si nanoarrays (hexagons, stages, cones) on Si (100) by precisely controlling etching time. Specifically, the nanostage arrays, with their high surface area due to neck regions, can absorb more Ag nanoparticles (AgNPs), leading to superior SERS performance through the formation of hotspots. In addition, COMSOL simulations confirm plasmon coupling inter-particle, particle-film, and inter-structure. The linear detection of Thiram (0.05–50 ppm) remains stable within 120 days, meeting practical requirements for pesticide detection and showing potential for food safety applications.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Bi Leyao,Fu Boyan,Lin Jiahui,Wen Junsheng,Fu Jiaxing,Zou Binglin,Su Ningning,Wang Chunjie,Wang Yue
Ag-modified ZnO coral-like nanosheets were synthesized for the first time using a simple hydrothermal method. Compared to other Ag-modified ZnO sensors, the sensor with 2 wt% Ag content demonstrates excellent ethanol-sensing performance. The maximum response value of 67.42 can be achieved at the optimal operating temperature of 260 °C for 100 ppm ethanol gas, with corresponding response/recovery time of 6/75 s, respectively. This sensor also exhibits superior selectivity, reproducibility, and long-term stability. Techniques such as XRD, XPS, SEM, and TEM were employed to characterize the physicochemical properties of the gas-sensitive materials. Further research indicates that the enhanced gas-sensing properties of the composite materials can be mainly attributed to the unique coral-like nanosheet structure, the relatively high-specific surface area (9.8706 m 2 /g), and the combined effects of the Ag-ZnO heterostructure, as well as the synergistic interplay of electronic sensitization and spillover effects. This research offers valuable insights into the modification of ZnO-based gas-sensing materials with noble metals. Graphical
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yingdong Hao,Yingxiao Wang,Pengyu Chen,Lu Chen,Wei Wei,Nannan Sun
Photocatalytic oxidation of methane (CH 4 ) to value-added chemicals offers a sustainable and promising approach for chemical synthesis, however, efficient catalysts for the activation of inert C H bonds remain challenging. Herein, a novel Ag-AgCl biphasic composite was used as co-catalysts to modify ZnO semiconductor (Ag-AgCl/ZnO-z). Structure properties and catalytic performance in photocatalytic oxidation of CH 4 of the sample were systematically investigated, together with comparison with pure ZnO (ZnO-z) and a single Ag modified counterpart (Ag/ZnO-z). It was found that Ag-AgCl/ZnO-z was enriched with heterogeneous interfaces, which facilitated ultrafast carrier transport and their prolonged separation. Interestingly, AgCl acted as a hole acceptor, and the lattice Cl can be directly activated to •Cl, which is then responsible for forming a new •CH 3 formation pathway via a hydrogen atom transfer (HAT) mechanism. Moreover, a Cl-looping process can be established so that the catalyst remained stable during cyclic reactions. Under the optimum conditions, an excellent liquid oxygenates productivity of 12,731 μmol·g −1 ·h −1 was achieved. This work presents a prototype for designing biphasic composite co-catalysts, thereby offering valuable insights into introducing multiple CH 4 activation pathways.
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
Yufeng Yang,Shijing Zhang,Jiamei Ma,Jiating Shen,Jiajun Huang,Xianglan Xu,Xiuzhong Fang,Junwei Xu,Xiang Wang
Adopting effective methods to identify clearly the active surface sites is crucial to engineer high-performance catalysts. To develop cost-effective and applicable NH 3 -SCR catalysts, the distribution states of Ag on HZSM-5 support have been identified by XRD and XPS extrapolation methods. As quantified, Ag dispersion on HZSM-5 has a threshold of 0.12 mmol Ag/100 m 2 . Above the threshold, bigger Ag 0 particles with better capability to activate O 2 and NO x molecules can be formed, thus achieving Ag/ZSM-5 catalysts with much better reaction performance below 300 °C. In contrast, below the threshold, Ag is mainly present in the form of highly dispersed nano-clusters/micro-crystallites, and partly as Ag + ions, thus being unfavorable to the reaction at low temperature. DFT calculation has testified that the aggregated Ag 0 particles with bigger sizes (>5 nm) have weaker interfacial interaction with the support, thus showing better capability to activate the reactant molecules. The optimal NH 3 -SCR performance is achieved on 8% Ag/ZSM-5 with a mean Ag size of 8.6 nm and a Ag 0 /Ag + ratio of 1.72, on which 100% NO conversion with a wide window from 250 to 400 °C can be achieved with H 2 assistance. In conclusion, both the Ag particle size and Ag 0 /Ag + ratio are the two main factors determining NH 3 -SCR performance on Ag/ZSM-5 catalysts.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 27
·18219-18226
·
IF 4.449
Weiyin Gao,Chenxin Ran,Minqiang Wang,Le Li,Zhongwang Sun,Xi Yao
Although reduced graphene oxide (rGO)-based photocatalyst composites have been intensively developed during the past few years, the influence of reduction extent of rGO on the photocatalytic performance of the rGO-based composite has virtually not been investigated due to some technical limitations, such as the poor water dispersibility of rGO and low reduction selectivity of the hydrothermal method, which make it difficult to control the reduction extent of rGO in these composites. Herein, we used a facile room-temperature method to synthesize Ag/AgX (X = Cl, Br)/rGO photocatalyst composites as a model to study the effect of reduction extent of rGO on the photocatalytic performance of the photocatalyst. It was found that the photocatalytic activities of both Ag/AgCl/PrGO and Ag/AgBr/PrGO systems had an optimized threshold of the reduction extent of photoreduced GO (PrGO). More importantly, due to the different conductive band values of AgCl and AgBr, the optimized thresholds in the two systems were at different PrGO reduction extents, based on which we proposed that the favorable energy band matching between AgX and PrGO in the two systems played a crucial role in obtaining high photocatalysis performance. Besides, the photocatalytic reaction of the Ag/AgBr based system was confirmed to be a pseudo-second-order kinetics reaction rather than pseudo-first-order kinetics reaction. The new insights presented in this work provided useful information on the design and development of a more sophisticated photocatalyst, and can also be applied to many other applications.
研究领域:
材料科学
·
环境科学
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MATERIALS LETTERS
·
2025
·
IF 2.7
Riyang Shu,Yongyuan Deng,Zhixi Tan,Fang Peng,Shuxian Pan
Photothermal catalytic sterilization is a popular and effective approach to recycle urban sewage. In this work, a novel efficient photothermal catalytic sterilization system by using in-situ prepared highly dispersed Ag/TiO 2 catalyst was proposed. The preparation of Ag/TiO 2 catalyst and the sterilization process were conducted in one pot, which presents a great advantage for the practical application. The Ag/TiO 2 catalyst showed good metal dispersion and superior photothermal effect. And the sterilization efficiency can be reached 99.1 % in the sterilization test of Escherichia coli . The sterilization condition was also optimized, by regulating the catalyst dosage and lighting time. Moreover, Staphylococcus aureus and urban domestic sewage were also tested for sterilization performance, with the sterilization efficiency as high as 93.2 % and 99.6 %.
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