NANOTECHNOLOGY
·
2018
·Vol. 29
·期 15
·154005
·
IF 3.404
Chunyang Dong,Songchang Hu,Mingyang Xing,Jinlong Zhang
A spatially separated, dual co-catalyst photocatalytic system was constructed by the stepwise introduction of RuO2 and Au nanoparticles (NPs) at the internal and external surfaces of a three dimensional, hierarchically ordered TiO2−SiO2 (HTSO) framework (the final photocatalyst was denoted as Au/HRTSO). Characterization by HR-TEM, EDS-mapping, XRD and XPS confirmed the existence and spatially separated locations of Au and RuO2. In CO2 photocatalytic reduction (CO2PR), Au/HRTSO (0.8%) shows the optimal performance in both the activity and selectivity towards CH4; the CH4 yield is almost twice that of the singular Au/HTSO or HRTSO (0.8%, weight percentage of RuO2) counterparts. Generally, Au NPs at the external surface act as electron trapping agents and RuO2 NPs at the inner surface act as hole collectors. This advanced spatial configuration could promote charge separation and transfer efficiency, leading to enhanced CO2PR performance in both the yield and selectivity toward CH4 under simulated solar light irradiation.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 106
·87132-87138
·
IF 3.84
Chao Li,Ying Lin,Feng Li,Linghui Zhu,Fanxu Meng,Dongming Sun,Jingran Zhou,Shengping Ruan
Hexagonal ZnO nanorings were synthesized using a one-step hydrothermal method and Au nanoparticles were decorated on the surface of the ZnO nanorings through a facile deposition process. The as-prepared ZnO nanorings showed a well-defined hexagonal shape with a width of 0.75–1.4 μm, a thickness of 0.17–0.33 μm and a hollow size of 0.2–1 μm. For the Au nanoparticle-decorated hexagonal ZnO nanorings (Au–ZnO nanorings), Au nanoparticles with a size of 3–10 nm were distributed discretely on the surface of the ZnO nanorings. The acetylene sensing performance was tested for the ZnO nanorings and Au–ZnO nanorings. The results indicated that the Au–ZnO nanorings showed a higher response (28 to 100 ppm acetylene), lower operating temperature (255 °C), faster response/recovery speed (less than 9 s and 5 s, respectively), and lower minimum detectable acetylene concentration (about 1 ppm). In addition, the mechanism for the enhanced acetylene-sensing performance of the Au–ZnO nanorings was discussed.
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LUMINESCENCE
·
2018
·Vol. 33
·期 7
·1268-1274
·
IF 1.671
Li Yang,Mulan Zeng,Yue Du,Li Wang,Bingxian Peng
A ratiometric fluorescence sensor for Cu 2+ detection was developed by employing carbon dots (CDs) as the reference fluorophore, and bovine serum albumin (BSA)–Au nanoclusters (AuNCs) both as specific recognition element and as response signal. The CDs were prepared by heating an acetic acid solution of chitosan at 180°C. The proposed nanoprobe was prepared by simply mixing the CDs and BSA–AuNCs. Here, the CDs were associated with BSA–AuNCs to form CDs/BSA–AuNCs nanoprobes based on electrostatic interaction and hydrogen bonds. In the hybrid fluorescent CDs/BSA–AuNCs nanoprobe, the emission of BSA–AuNCs at 640 nm was quenched by Cu 2+ , whereas the emission of CDs at 424 nm was maintained. The fluorescence changes of I 640 / I 424 had good linearity with Cu 2+ concentration in the range 1.5–600 nM, and the detection limit of the nanoprobe was 0.5 nM for Cu 2+ detection, almost 4 × 10 4 times lower than the maximum allowable amount of Cu 2+ in drinking water. The proposed method for detecting Cu 2+ also had high selectivity and feasibility.
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高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Wanqi Zhao,Panpan Lin,Tiesong Lin,Peng He,Weimin Long,Ruyu Tian
Owing to the isothermal solidification of eutectic Au-Si filler, GH3039 joints were successfully manufactured at 430 °C. After Ti modified, GH3039 joints that could endure 800 °C were creatively achieved through the transformation of reaction layers. Dispersed Ni 49 Ti 14 Si 37 whiskers and CrSi 2 fine particle layer formed at the interface instead of continuous Ni 3 Si layer. This improved the joint shear strength to 131 MPa at room temperature and 15 MPa at 800 °C. Joining at low temperature but applying at high temperature offers a new option for the dissimilar bonding of Ni-based superalloy and ceramics that is in need of the residual stress alleviation.
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 14
·6856-6862
·
IF 7.79
Fan Yang,Chunzheng Wu,Hongbo Yu,Shiwei Wang,Tong Li,Bo Yan,Hongfeng Yin
Nanosized Au catalysts suffer from serious sintering problems during synthesis or catalytic reactions at high temperatures. In this work, we integrate dumbbell-shaped Au–Fe3O4 heterostructures into hollow ZrO2 nanocages to make Au–Fe2O3@ZrO2 yolk–shell nanoreactors with high activity as well as ultra-high sintering resistance for high-temperature CO oxidation. The synthesis starts with the fabrication of a (Au–Fe3O4)@SiO2@ZrO2 core–shell nanostructure with a Au–Fe3O4 dumbbell nanoparticle (DB) core and SiO2/ZrO2 double shells, followed by calcination and the selective removal of the inner SiO2 shell with alkaline solution to obtain Au–Fe2O3@ZrO2 nanoreactors. The retained ZrO2 hollow (outer) shells protect the Au NPs from aggregation at temperatures up to 900 °C and show excellent long-term stability. Compared to Au@ZrO2 yolk–shell nanoreactors, Au–Fe2O3@ZrO2 shows improved activity in CO oxidation due to the active Au–Fe2O3 interface. This strategy can be extended to other yolk–shell nanoreactors with various nanocomposites and for different catalytic reactions.
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Materials
·
2022
·Vol. 16
·期 1
·387
·
IF 3.748
Kezhu Xu,Qunling Fang,Jing Wang,Ailing Hui,Shouhu Xuan
Due to the abuse of antibiotics, the sensitivity of patients to antibiotics is gradually reduced. This work develops a Fe3O4@SiO2@Au/PDA nanochain which shows an interesting magnetic-field-induced improvement of its photothermal antibacterial property. First, SiO2was wrapped on Fe3O4nanospheres assembled in a chain to form a Fe3O4@SiO2nanocomposite with a chain-like nanostructure. Then, the magnetic Fe3O4@SiO2@Au/PDA nanochains were prepared using in situ redox-oxidization polymerization. Under the irradiation of an 808 nm NIR laser, the temperature rise of the Fe3O4@SiO2@Au/PDA nanochain dispersion was obvious, indicating that they possessed a good photothermal effect. Originating from the Fe3O4, the Fe3O4@SiO2@Au/PDA nanochain showed a typical soft magnetic behavior. Both the NIR and magnetic field affected the antimicrobial performance of the Fe3O4@SiO2@Au/PDA nanochains.Escherichia coliandStaphylococcus aureuswere used as models to verify the antibacterial properties. The experimental results showed that the Fe3O4@SiO2@Au/PDA nanochains exhibited good antibacterial properties under photothermal conditions. After applying a magnetic field, the bactericidal effect was further significantly enhanced. The above results show that the material has a broad application prospect in inhibiting the growth of bacteria.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Han Lin,Liping Song,Youju Huang,Qian Cheng,Yanping Yang,Zhiyong Guo,Fengmei Su,Tao Chen
The self-assembled gold nanoparticle (NP) superlattice displays unusual but distinctive features such as high mechanical and free-standing performance, electrical conductivity, and plasmonic properties, which are widely employed in various applications especially in biological diagnostics and optoelectronic devices. For a two-dimensional (2D) superlattice monolayer film composed of a given metal nanostructure, it is rather challenging to tune either its plasmonic properties or its optical properties in a reversible way, and it has not been reported. It is therefore of significant value to construct a free-standing 2D superlattice monolayer film of gold nanoparticles with an intelligent response and desired functions. Herein, we developed an easy and efficient approach to construct a gold nanoparticle superlattice film with a dual-responsive plasmonic switch. In this system, gold nanoparticles were coated by polyaniline (PANI) and then interracially self-assembled into a monolayer film at the air–liquid interface. The PANI shell plays two important roles in the superlattice monolayer film. First, the PANI shell acts as a physical spacer to provide a steric hindrance to counteract the van der Waals (vdW) attraction between densely packed nanoparticles (NPs), resulting in the formation of a superlattice by adjusting the thickness of the PANI shell. Second, the PANI shells provide the superlattice film with multiple stimuli such as electrical potential and pH change, leading to reversible optical and plasmonic responsiveness. The superlattice monolayer film can show a vivid color change from olive green to pink, or from olive green to violet by the change of the corresponding stimuli. Also, the localized surface plasmonic resonance (LSPR) of the superlattice monolayer film can be reversibly modulated by both by changing the local pH and applying an electric potential. Notably, a significant plasmonic shift of 157 nm can be achieved in the superlattice monolayer film when the PANI shell with a thickness of 35 nm and gold nanorods as a core were used. The superlattice monolayer film with dual-responsive plasmonic switches is promising for a range of potential applications in optoelectronic devices, plasmonic and colorimetric sensors, and surface-enhanced Raman scattering (SERS).
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高影响因子
JOURNAL OF LUMINESCENCE
·
2015
·
IF 2.719
Yan Song,Guixia Liu,Xiangting Dong,Jinxian Wang,Wensheng Yu
Luminescence resonance energy transfer (LRET) system can be constructed using NaYF 4 :Tb 3+ luminescence nanocrystals and gold nanoparticles (AuNPs) served as energy donor and acceptor, respectively. The AuNPs modified by cetyltrimethylammonium bromide (CTAB) were synthesized first and NaYF 4 :Tb 3+ shells encapsulated Au cores via a hydrothermal method . The synthesized materials were well characterized by X-ray diffraction (XRD), Fourier-transform infrared spectra (FT-IR), Transmission electron microscopy (TEM), X-ray photoelectron spectrum (XPS), UV–vis absorption spectra (UV–vis) and photoluminescence (PL) measurement. The results indicate that the synthesized Au@NaYF 4 :Tb 3+ core–shell nanoparticles have spherical morphology with a size of 80–90 nm and the shell layers of NaYF 4 :Tb 3+ nanocrystals have pure cubic structure. The luminescence properties of Au@NaYF 4 :Tb 3+ core–shell nanoparticles are same as those of NaYF 4 :Tb 3+ particles. The LRET process was realized using the core–shell nanoarchitectures due to the absorption spectrum of AuNPs matches well with the major emission peaks of Tb 3+ ions. The LRET experiments have successfully verified the energy transfer between NaYF 4 :Tb 3+ nanocrystals and AuNPs. Additionally, the emission intensities of Tb 3+ ions and the content of AuNPs exhibited a fair linear correlation.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Benlin Dai,Xin Chen,Xiaofan Yang,Gang Yang,Shijie Li,Lili Zhang,Feihu Mu,Wei Zhao,Dennis Y.C. Leung
A novel S-scheme Au/g-C 3 N 4 /BiO 1.2 I 0.6 plasmonic heterojunction was constructed by calcining a mixture of flower-like BiOI and Au/g-C 3 N 4 nanosheets for the first time. This Au/g-C 3 N 4 /BiO 1.2 I 0.6 heterojunction exhibited excellent photocatalytic activity in bisphenol AF (BPAF) degradation and Cr(VI) reduction with high cycle stability under visible light irradiation. In particular, the photocatalytic performance of the optimum material developed (4-Au/g-C 3 N 4 /BiO 1.2 I 0.6 ) can reach 0.0174 min −1 (apparent rate of BPAF degradation) and 0.0204 min −1 (apparent rate of Cr(VI) reduction), which were 6.5 and 3.7 times that of pristine g-C 3 N 4 , respectively. The high photocatalytic performance was due to the high efficiency of charge separation, the excellent light absorption of localized surface plasmon resonance (LSPR) caused by the Au deposition, and the formation of S-scheme heterojunctions, which maintained strong photocatalytic reduction and oxidation activity. Noticeably, the charge density difference and band offsets of the g-C 3 N 4 /BiO 1.2 I 0.6 were calculated. The results revealed that an internal electric field (IEF) was created, which further demonstrated the formation of an S-scheme photocatalytic mechanism.
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高影响因子
Results in Physics
·
2023
·
IF 5.3
Zhenglong Hu,Lun Tan,Xingxing Fu,Yijing Fan,Meng Sun,Di Zhou,Zhao Wang,Zeping Li,Siliu Xu,Haoshaung Gu
The detection of indoor formaldehyde concentration attracted great attention owing to its serious harm to human bodies. Traditional semiconductor formaldehyde sensors are still suffering from high working temperature and slow response and recovery performance. In this work, a room-temperature semiconductor formaldehyde gas sensor with fast response and high selectivity were developed by exploiting the synergistic effect of Au decoration on MoO 3 nanoribbons. The metallic Au nanocrystals with size lower than 10 nm were prepared by a chemical reduction method and uniformly distributed on the surface of the [1 0 0] -oriented orthorhombic MoO 3 nanoribbons after the surface decoration. The results show that the surface decoration by Au nanoparticles could greatly fasten the response and recovery speed of the sensors at room temperature. Under an optimal composition with Au/Mo atomic ratio of 0.10%, the response and recovery time towards 100 ppm HCHO could be decreased to 4.5 and 3 s. The sample also exhibited high sensitivity and low limit of detection of 1 ppm. Meanwhile, the sensor exhibited highly selective HCHO response with 1–2 magnitude higher sensor response against toluene, ethanal, methanol and acetone. The performance enhancement should be attributed to synergistic effect induced by the surface Au decoration, which not only serves as the catalysts improving the gas adsorption and desorption efficiency, but also introduced additional contribution to the formaldehyde response by forming the metal–semiconductor interface states.
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Science China-Technological Sciences
·
2017
·Vol. 60
·期 5
·749-757
·
IF 1.719
Zhu YuMei,Zhou XiaoWei,Chen DongSheng,Li Fang,Xue Tao,Farag Ahmed Saad
Magnetic Fe 3 O 4 @PANI@Au nanocomposites are fabricated through electrostatic self-assembly and seed growth methods. The rate constant K
app is calculated to be 8.63×10 −3 s −1 at room temperature for the reduction of 4-nitrophenol to 4-aminophenol with an excessive amount of NaBH4 as a model system showing outstanding catalytic efficiency and stability. For recyclable performance, the catalyst exhibits slight loss in catalytic performance on the conversion of 4-nitrophenol after running for more than 10 cycles. Besides, the smaller and simpler the structure, the easier the molecular structure can be degraded, and the faster the cationic dyes can be degraded than the anionic dyes, which can reveal the selectivity. For practical application, Congo red as a pollutant of the lake water is degraded rapidly after Fe 3 O 4 @PANI@Au is added to the solution in a few minutes. It has been demonstrated that magnetic Fe 3 O 4 @PANI@Au nanoparticle composite is a promising catalyst for environment sewage.
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Chemistry-An Asian Journal
·
2020
·Vol. 15
·期 24
·4280-4285
·
IF 4.056
Zhipeng Sun,Lei Sheng,Hao Gong,Li Song,Xiaolong Jiang,Shengyao Wang,Xianguang Meng,Tao Wang,Jianping He
In this work, a series of gold-supported titanium oxide composites have been prepared and high selectivity (over 90%) of hydrogen peroxide is achieved. For the first time, electrochemical impedance spectroscopy and electron spin resonance analysis demonstrate that high charge transfer impedance of the catalyst can suppress the decomposition of OOH* intermediates thus promoting the two-electron process of the oxygen reduction reaction.
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高影响因子
危险品化学品经营许可证（带存储）