Journal of the American Chemical Society
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2020
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IF 14.612
Mei-Yan Gao,Kai Wang,Yayong Sun,Dejing Li,Bai-Qiao Song,Yassin H. Andaloussi,Michael J. Zaworotko,Jian Zhang,Lei Zhang
A series of increasingly large silver nanoclusters with a varied combination of Archimedean and/or Platonic solid arrangements was constructed using a flexible trifurcate TiL3 (L = Salicylic acid or 5-fluorosalicylic acid) metalloligand: Ag4@Ag4@Ti4 (PTC-85), Ag12@Ti4 (PTC-86), Ag4@Ag6@Ag12@Ti4 (PTC-87), Ag6@Ag24@Ag12@Ti4 (PTC-88), and Ag12@Ag24@Ti4 (PTC-89). The silver nanoclusters are each capped by four TiL3 moieties, thereby forming {Ti4} supertetrahedra with average edge lengths ranging from ∼8.12 Å to ∼17.37 Å. Such {Ti4} moieties further induce the tetrahedral geometry of the encapsulated silver nanoclusters. These atomically precise metallic clusters were found to be ultrastable with respect to air for several months, and to water for more than 3 days, due to the stabilizing effects of the TiL3 metalloligand. Moreover, the obtained clusters exhibit nonlinear optical (NLO) effects in optical limiting tests and also temperature-dependent photoluminescent properties. This work provides an interesting metalloligand method not only to induce the spatial growth of metallic clusters to achieve highly symmetric structures, but also to enhance their stability which is crucial for future application.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Tengda Shi,Pei Liang,Xiubing Zhang,De Zhang,Haibo Shu,Jie Huang,Zhi Yu,YongQuan Xu
An ex situ method was used to synthesize noble metals and metal oxide composite materials, due to the selective adsorption properties of metal oxides, the adsorption of different probe molecules by this composite structure had been studied. In the ex situ approach, we use (3-aminopropyl) diethoxy methylsilane (ATES) as a coupling agent which is easy for noble metal nanoparticles deposited on metallic oxide nanomaterials . The Raman scattering (SERS) substrate of 1D MoO 3 nanowires (MoO 3 -NWs) @Ag nanoparticles (Ag-NPs) hybrid surface had been fabricated. Several parameters are presented in the following which influences the morphology of self-assembly and SERS activity: (i) coupling agent of ATES, (ii) ATES content (iii) Ag-NPs content. The finite difference time domain (FDTD) method is to explain the enhancement mechanism distribution of the hybrid substrate. Different probe molecules (R6G, Methylene Blue , Crystal Violet , and 4-ATP) have been adsorbed for SERS tests. Improved principle component analysis (PCA) is adopted to obtain the minimum detection limit of probe molecules. Through the DFT calculation, different absorption strengths between the target molecules and the MoO 3 (010) surface have been illustrated, which is also the main reason for the selective enhancement effect of MoO 3 @Ag hybrid nanostructures. This paper might propose a method to prepare such enhancement substrate based on the selective absorption properties of oxide semiconductors.
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APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Bin Sun,Furong Tao,Zixuan Huang,Wei Yan,Yuxin Zhang,Xusheng Dong,Yue Wu,Guowei Zhou
As a novel transition metal carbides and/or carbonitrides, MXene possess two-dimensional characteristic, abundant surface hydrophilic functional groups, and excellent electrical conductivity that bestow a possibility to building MXene-based photocatalysts. Inspired by this, an emerging Ti 3 C 2 MXene cocatalyst bridged Ag/Ag 3 PO 4 to induce a highly visible-light-driven photocatalytic activity, synthesized by electrostatic self-assembly method and the partial reduction of Ag + ions to Ag 0 in MXene solution is reported. The resultant hybrids reveal a well-defined hybrid structures with Ag/Ag 3 PO 4 anchoring on the layer structured Ti 3 C 2 nanosheets. Benefiting from the unique structural features, the Ag/Ag 3 PO 4 /Ti 3 C 2 hybrids present Ti 3 C 2 content-dependent photocatalytic activity toward the methyl orange (MO) degradation and Cr(VI) reduction under visible-light irradiation. Remarkably, the Ag/Ag 3 PO 4 /Ti 3 C 2 hybrid with 3 wt% Ti 3 C 2 content achieves the greatest MO degradation efficiency and Cr(VI) reduction efficiency after irradiation for 1 h, which are increased to 1.72 and 1.46 times higher than that obtained on pristine Ag 3 PO 4 nanoparticles, respectively. Such impressive photocatalytic activity is related to the synergeric effects derived from Ag, Ag 3 PO 4 , and Ti 3 C 2 , which greatly enhance visible light absorption, promote separation and transfer of photo-generated electron-hole pairs. This work highlights that the MXene-based photocatalysts would be desirable candidates for environmental purification of organic pollutants and heavy metal ions.
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CERAMICS INTERNATIONAL
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2019
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IF 3.45
Zhongyang Wang,Peitao Xie,Guohua Fan,Zidong Zhang,Yao Liu,Qilin Gu,Runhua Fan
Epsilon-negative behavior in metamaterials has attracted increasing attention recently. In this work, excessively percolating BaTiO 3 /Ag composites were synthesized by an in-situ preparation method to achieve negative permittivity. The epsilon-negative behavior is explained by low-frequency plasma oscillation of free electrons, which can be well fitted by the Drude model. Moreover, the negative permittivity of composites can be tuned by adjusting the content of randomly distributed Ag particles. The ac conductivity of excessively percolating BaTiO 3 /Ag composites shows a typical metal-like behavior. Furthermore, the investigation of reactance reveals that the inductive character derived from the conductive network is the main contributor to negative permittivity, as confirmed by the equivalent circuit analysis. This work provides a theoretical recipe for designing negative permittivity, supplements the family of metamaterials, and would further facilitate the practical applications of epsilon-negative materials in electromagnetic devices.
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APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Huiqin Wang,Jingru Guan,Jinze Li,Xin Li,Changchang Ma,Pengwei Huo,Yongsheng Yan
In this work, the ordered mesoporous CeO 2 (m-CeO 2 ) was successfully fabricated via the nanocasting pathway, through using SBA-15 as a hard template. Besides, g-C 3 N 4 /Ag/m-CeO 2 composite was successfully constructed by calcination method. Meanwhile, the obtained samples were investigated by series of test techniques. The XRD, SEM and TEM results show that the m-CeO 2 and Ag/m-CeO 2 with the ordered mesoporous trait. Besides, the EPR, Raman and XPS results suggest that the oxygen vacancies (O v ) and Ce 3+ and Ce 4+ are in g-C 3 N 4 /Ag/m-CeO 2 . In addition, the ordered mesostructure is favorable for the CO 2 molecular movement and adsorption/desorption reaction. The g-C 3 N 4 nanosheets, a promising material possessing suitable conductor band, large specific area, non-toxicity, and outstanding chemical stability, is a candidate semiconductor for CO 2 conversion. The introduction of g-C 3 N 4 nanosheets to Ag/m-CeO 2 overcomes the photocorrosion of Ag nanoparticles and Ag facilitate the transfer of photogenerated electrons. The photocatalytic activity results show that when the loading of Ag is 7 wt%, the g-C 3 N 4 /7Ag/m-CeO 2 composite exhibits the superiority activity for CO 2 photoconversion to CO (13.94 μmol/g) and CH 4 (7.39 μmol/g) under UV-irradiation in 10 h.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Xuesheng Liu,Xueli Li,Xuewei Liu,Sisi He,Junsu Jin,Hong Meng
To improve the photocatalytic performance of ZnO nanoparticles , based on the collective effect as electron sink of Ag and perfect two-dimensional (2-D) feature of graphene, Ag-ZnO-rGO nanoparticles were prepared by polyvinyl alcohol assisted freeze-drying and subsequent hydrothermal reduction method. Through photocatalytic degradation of methyl orange solution under UV irradiation , all as-prepared samples were assessed and compared with those of published works. The surface morphology , microstructure and optical property of materials were systematically studied by XRD , XPS , SEM , TEM and DRS , respectively. XPS and Raman spectra results confirmed that GO has successfully been reduced to rGO; SEM and TEM characterizations manifested that Ag-ZnO NPs were uniformly distributed in rGO with two-dimensional sheets structure; DRS characterization and Kubelka-Munk formula calculation illustrated that Ag-ZnO-rGO exhibited the smallest band gap and the best optical absorption performance. Moreover, the photocatalytic degradation results indicated that Ag-ZnO-rGO NPs combine the advantages of graphene and Ag which not only has significant adsorption but also maintains high photoreactivity.
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Materials
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2022
·Vol. 16
·期 1
·201
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IF 3.748
Luping Tang,Chen Liao,Yingqing Guo,Yangyang Zhang
Metal nanoparticles have attracted a great deal of interest due to their unique properties of surface plasmon resonance. Metal nanoparticles can enhance the fluorescence emission intensity of quantum dots (QDs) through the local surface plasmon resonance effect, which is mainly determined by the distance between them. Therefore, it is very important to achieve controllable distance between metal and QDs, and study fluorescence enhancement. In this work, the controllable adjustment of the distance between metal nanoparticles and QDs was successfully realized by controlling the thickness of the SiO2shell of Ag@SiO2nanoparticles. Firstly, Ag nanoparticles with uniform size distribution and relatively high concentration were prepared, and then the thickness of the SiO2shell was controlled by controlling the amount of tetra-ethyl orthosilicate (TEOS) in the hydrolysis of TEOS reaction. (3-aminopropyl) triethoxysilane (APS) was used to connect CdS/ZnS QDs with Ag@SiO2nanoparticles to form Ag@SiO2@CdS/ZnS QD composite nanoparticles. The fluorescence spectra shows that the fluorescence intensity of the Ag@SiO2@CdS/ZnS QD composite nanoparticles is significantly enhanced. Photoexcitation spectra and fluorescence spectra of CdS/ZnS QD and Ag@SiO2@CdS/ZnS QD composite nanoparticles, measured under different energy excitation conditions, indicate that the existence of Ag nanoparticles can enhance the fluorescence intensity of CdS/ZnS QDs. Finally, a further physical mechanism of fluorescence enhancement is revealed.Keywords:Ag-SiO2;fluorescence enhancement;transmission electron microscope;quantum dots;photoexcitation spectra
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ChemistrySelect
·
2022
·Vol. 7
·期 45
·e202202260
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IF 2.307
Minghui Wang,Ting Shu,Xinfeng Ge,Jun Hu,Yunxiao Liang
Graphical The 3D continuous pass-through macroporous channels allow fast mass transfer. Abundant mesopores with short channel remarkably enhance the accessibility of the active sites. The abundant micropores provide large amounts of anchoring sites for Ag NPs loading. The uniformly dispersed and ultrafine Ag NPs (2.04 nm) can transfer the interfacial electrons from BH4 − to 4-NP − more efficiently. Developing easily recyclable noble metal nanoparticle-based heterogeneous catalysts is highly desirable for the practical applications. Herein, a millimeter-sized hierarchical porous titanosilicate (HPTS) was prepared by the multi-template method. Various characterization results reveal that HPTS combines the structural advantages of monolith materials and nanomaterials. HPTS is used as an advanced support to construct the Ag/HPTS catalysts via the Ag + in situ reduction on its pore wall. Ag/HPTS shows high catalytic activity for 4-nitrophenol (4-NP) reduction with the TOF values of 3.91 min −1 , which can be attributed to the ultrafine Ag NPs (2.04 nm) and the unique structure of HPTS. The 3D pass-through macroporous channels facilitate mass transfer. The mesopores with ultra-short channel remarkably enhance the accessibility of the active sites. The abundant mesopores and micropores effectively confine the Ag NPs size. Moreover, Ag/HPTS demonstrated good stability and recyclability.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Naijian Hu,Xiucai Wang,Jia Yang,Meng Liu,Jianwen Chen,Xinmei Yu,Wenbo Zhu,Minggao Zhang
Owing to their degradability, environmental friendliness, and low cost, natural polymers have been widely utilized in the fabrication of triboelectric nanogenerators (TENGs). Chitosan is a natural polymer containing long chains of n-acetylamino glucose. However, the low dielectric constant of pure chitosan films affects their electrical properties. Therefore, in this study, to improve their electrical output performance, the dielectric constant of the films was increased by the incorporation of conductive nanoparticles. Highly transparent Ag/Chitosan films were successfully constructed, and the output performance was improved by varying the concentration of Ag nanoparticles (100–200 nm). At a concentration of 6 wt %, the open-circuit voltage, short-circuit current, and transferred charge reached 74 V, 4.6 μA, and 23.8 nC, respectively, with a maximum output power of 83 μW. Besides, the fabricated friction-based nanogenerator (AC-TENG) lit 20 blue light-emitting diodes (LEDs) and successfully drove a commercial calculator, which verified its practical application potential. Finally, the AC-TENG was used to transmit Morse code, successfully sending the signals “HELP” and “SOS”, which might open opportunities in the field of communication application.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2023
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IF 2.7
Yue-Feng Tang,Meng-Yun Zhao,Guo-Zhi Han
Herein, a novel composite of g-C 3 N 4 and silver nanoparticles(g-C 3 N 4 @Ag) with enhanced bifunctional catalytic activity through chemical etching is reported. A kind of g-C 3 N 4 @Ag composite by one-pot route, then treated the product with sodium borohydride (NaBH 4 ) solution for a certain time is first synthesized. The property and morphology of the g-C 3 N 4 @Ag composite changed greatly after the treatment. Compared with the pristine g-C 3 N 4 @Ag composite, the NaBH 4 -etching endowed g-C 3 N 4 @Ag composite (RACN) with smoother two-dimensional plane structure, as well as an extension of the conjugate system which originating from the stronger chemical connection between the Ag nanoparticles and g-C 3 N 4 . Furthermore, research results indicated that the RACN showed superior broad-spectrum catalytic performance for the reduction of aromatic nitro compounds, and the catalytic efficiency of the RACN is enhanced dozens of times by the treatment. Moreover, the photocatalytic activity of the RACN is also greatly improved. This discovery provides an efficient and facile method toward the enhancement of catalytic activity of semiconductor and metal nanoparticle composites by chemical etching.
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ANALYTICAL CHEMISTRY
·
2024
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IF 6.7
Zhipeng Zhang,Qi Liu,Kecen Chen,Xiaoxing Li,Ruili Li,Xiaoqing Chen
Toward the challenges of signaling transduction amplified in enantioselective recognition, we herein devised an innovative strategy for highly selective recognition of amino acids and their derivatives, leveraging photothermal effects. In this approach, bifunctional l-ascorbic acid is employed to reduce silver ions in situ on Au nanostars. Simultaneously, its oxidate (l-dehydroascorbic acid) is bonded to the silver shell as a chiral selector to prepare chiral nanoparticles (C-AuNS@Ag NPs) with the ability to recognize stereoisomers and sensitively modulate the photothermal effect. l-Dehydroascorbic acid can selectively capture one of the enantiomers of the two forms through hydrogen bonding and drive aggregation of the nanoparticles, which sharply enhances the photothermal effect. Consequently, the two forms of the system exhibit a significant temperature difference, which enables the discrimination and quantification of enantiomers. Our strategy verifies that six chiral amino acids and their derivatives can be discriminated with enantioselective response values of up to 79. Additionally, the chiral recognition mechanism was revealed through density functional theory (DFT) calculations, providing a paradigm shift in the development of enantiomeric recognition strategies.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 6
·49806
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IF 2.52
Dexin Chen,Zhixin Kang,Wei Li
Here, thin Ag films with excellent properties were successfully prepared on flexible substrates through surface grafting and assembling followed by simple spray-assisted deposition process. The constructed molecule brushes provide the interfacial adhesion for Ag layers onto polymer substrates. The mechanical and electrical properties of the conductive Ag coated PET could be tuned by changing the spraying passes. As the electromagnetic interference shielding material, the composite PET possesses a highest shielding efficiency of 45 dB. In addition, the Ag coated PET with the thickness of 0.1 mm would maintain the 72% electrical conductivity even been folded even at a minimum diameter of 0.2 mm. It was demonstrated that uniform and fine cracks would generate when the Ag coated PET was stretching, but Ag films still retain continuous networks to maintain the high electronic conductivity even stretching to 100%. Simple finite element modeling results prove that the stress by stretching would concentrate in corner of the crack and the deformation is mainly at stress side. The Ag layers were also produced on TPU substrates to detect the stretching, showing its potential applications for strain sensors and health monitoring systems.
研究领域:
材料科学
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电子工程
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