ACS Applied Nano Materials
·
2020
·
IF 0
Junshan Hu,Ruonan Wang,Rangrang Fan,Fengyi Wang,Huiyu Xiong,Zhenghu Huang,Lixin Liu,Hao Fu
Here, we report a nanocomposite with excellent photothermal performance promising for photothermal treatment. This nanocomposite is prepared by linking Au nanorods (NRs) to NaGdF4:18% Yb3+, 2%Er3+@NaYF4 core–shell upconversion nanoparticles (UCNPs) with bridging of polyethylene glycol molecules. Solutions with the composite nanoparticles can be heated by the irradiation of a near-infrared 980 nm laser, and the photothermal effect in terms of temperature rise can reach 21.3 °C with excitation power density as low as 0.090 W/cm2. This highly effective photothermal performance is attributed to coincidence of the emission band of the UCNPs and the absorption band of the Au NRs, which facilitates the light-to-heat conversion. The structure of the composite and the concentration of the Au NRs in the solution are also optimized through the emission intensity, green-to-red intensity ratio, and the photothermal effect in this work. Compared with previous research studies, the strength in the lower irradiation power density makes the nanocomposite promising for further photothermal treatment and temperature sensing.
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RARE METALS
·
2021
·Vol. 41
·期 2
·630-638
·
IF 4.003
Qiu Jia-Jun,Yang Ting-Ting,Li Yi-Fan,Qian Wen-Hao,Liu Xuan-Yong
Although titanium and its alloys are extensively used in orthopedics and dentistry fields, implant failures still happen because of implant-associated infections. Herein, Au@Ag@Pt core–shell nanorods with noble metal combination were fabricated and assembled on medical titanium surface and the antibacterial activity and biocompatibility were investigated. The results showed that antibacterial rates of Ti–Au@Ag@Pt against S. epidermidis and P. aeruginosa were 89.7% and 92.7%, respectively. Besides, Ti–Au@Ag@Pt showed no obvious cell toxicity with MC3T3-E1 cells grew well on the sample surface. It was discovered that the Pt shell layer on Ti–Au@Ag@Pt slowed down the Ag ion release rate which endowed medical titanium surface with both antibacterial activity and good biocompatibility. Graphical abstract
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Panyu Yan,Xinchao Zhang,Xiaomei Wang,Xu Zhang
A unique structural transition from pomegranate-like monodisperse mesoporous silica microspheres (M-MSMs) with tunable mesopores to mesoporous silica microcapsules has been reported. The unique evolution occurred together with varying the cross-linking degrees (CLDs) of templates. Herein, using monodisperse sulfonated cross-linked polystyrene (S-CLPS) as templates, S-CLPS/SiO2 composite microspheres were synthesized by the sol–gel method. Subsequently, the templates were removed by calcination to obtain the M-MSMs or microcapsules. The pore sizes of M-MSMs could be tailored from 3.2 to 7.4 nm by facilely varying the CLDs from 0.5 to 20%. Interestingly, mesoporous silica microcapsules were gradually formed when the CLDs were beyond 20%. Meanwhile, the specific surface area also could be adjusted by this strategy without hardly affecting the monodispersity, and the specific surface area increased to 391.9 m2/g. Significantly, Au@M-MSM was prepared by supporting Au nanoparticles (NPs) on M-MSM and used as nanocatalysts to reduce 4-nitrophenol (4-NP). The ultrathin shell and interconnected three-dimensional (3D) porous structure of M-MSMs can increase the mass transfer and protect the Au NPs from leakage, which reveals high recyclability and high conversion (>95%) after 10 regeneration–catalysis cycles. This approach provides a nanotechnology platform for the preparation of mesoporous silica materials with different microstructures, which will have enormous potential in practical applications involving different molecular sizes.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Jiyang Liu,Haojie Yu,Li Wang
The catalysis performance of noble metal nanoparticles always suffered from harsh aggregation during reaction hence promising supports that were able to restrict as well disperse the NPs were in great demand. Herein we reported a bottom-up synthesis of ultrathin two dimensional ferrocene based metal-organic framework (FMOF) nanosheets employing ZrCl 4 and 1,1′-ferrocene-dicarboxylic acid as metal nodes and organic ligands respectively. Employed as a stable and easy-contacted support, Au NPs were reduced and attached on the surface of FMOF nanosheets with average diameter of ca. 5 nm. The obtained Au/MOF composite was used in the reduction of 4-nitrophenol to 4-aminophenol, and rapid conversion of almost 100% could be achieved in 5 min with a maximum TOF of 10.9 × 10 −4 mol min −1 m 2 . Moreover, after 10 cycles of the reusability test, there was no obvious decline in catalytic performance with conversion of almost 100%, confirming the unprecedented stability of this Au-MOF composite.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 4
·1-7
·
IF 6.232
Xie Zheng-Jun,Shi Mei-Rong,Wang Li-Ying,Peng Chi-Fang,Wei Xin-Lin
We report the first use of metallic nanozyme as colorimetric probe for Pb 2+ determination. The method is based on the surface leaching of Au@PtNP nanozyme by Pb 2+ -S 2 O 3 2− ions, accompanied by a decreased catalytic activity of the metallic nanozyme. To construct this colorimetric determination, the Pt deposition onto the AuNPs was carefully investigated and other experimental factors including kind of substrate and buffer were optimized. With increasing Pb 2+ concentration, the catalytic activity of the Au@PtNPs decreased gradually. As a result, the blue color at 650 nm from the oxidation of 3,3′,5,5′-tetramethylbenzidine by H 2 O 2 faded gradually. A determination limit of 3.0 nM Pb 2+ with a linear range from 20 to 800 nM was obtained. The assay demonstrated negligible response to common metal ions even at elevated concentrations. This colorimetric method was applied to the determination of Pb 2+ ions spiked in lake water samples, and good recoveries (96.8–105.2%) were obtained. The above results indicate the potential application of metallic nanozymes in developing robust colorimetric assays.
Schematic representation of the surface leaching of Au@PtNP nanozyme by Pb 2+ -S 2 O 3 2− ions, accompanying the decreased catalytic activity of the metallic nanozyme
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高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Ting Zhou,Min Fan,Ruiyun You,Yudong Lu,Luqiang Huang,Yunchao Xu,Shangyuan Feng,Yang Wu,Huiying Shen,Lanjin Zhu
We have successfully prepared a highly sensitive sandwich nanosensor combined Fe 3 O 4 and [email protected] @Ag nanorods for histamine detection based on surface-enhanced Raman spectroscopy (SERS). The Fe 3 O 4 beads with –COOH served as a capture part to enrich histamine. The [email protected] @Ag core-shell nanorods functionalized with Nalpha,Nalpha-Bis(carboxymethyl)- l -lysine (AB-NTA) were then used to connect with the imidazolyl group of histamine, simultaneously the internal standard 4-aminothiophenol (4-ATP) in the core-shell structure was used as the SERS signal. PLS regression model based on concentration range 10 −3 -10 −8 mol/L showed a linear trend with R 2 = 0.9907. Our new approach can quickly and reliably determine histamine in fish sample and RAW264.7 cell lysates. This protocol for histamine extraction and SERS analysis enables the development of ultra-sensitive method for histamine detection.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 8
·4945-4951
·
IF 1.774
Li Yan,Zhang Lin-Bin,Song Shuang,Lian Xiao-Xue
Au/Y-ZnO composite with excellent acetone sensing was successfully prepared by a facile wet chemical method. X-ray diffraction analysis, field-emission scanning microscopy, and transmission electron microscopy investigation revealed that the obtained Au/Y-ZnO was mainly composed of ZnO wurtzite phase and Au nanoparticles with a face-centered structure in diameter of 10 nm, and Y atom replaced Zn lattice sites to form yttria phase. Compared with the pure ZnO and Y-doped ZnO, the Au/Y-ZnO-based sensor shows significantly enhanced acetone gas sensing. Its response to 100 ppm acetone is 27.6, which is about 2.3 and 5.5 times that of the Y-ZnO and the pure ZnO, respectively. The Au/Y-ZnO-based sensor has a low detection limit (1 ppm), and fast response (3 s) and recovery (9 s). Au modification can obviously decrease the operating temperature (275°C). The enhanced gas-sensing of Au/Y-ZnO towards acetone can be ascribed to Y Zn and V
− Zn
defects, the Schottky barrier between Au nanoparticles and Y-doped ZnO, and the catalytic activity of the Au nanoparticles.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jianghua Yang,Tao Shao,Cong Luo,Jinling Li,Shijie He,Bowen Meng,Qiankun Zhang,Dongxia Zhang,Zhonghua Xue,Xibin Zhou
Au-GQDs@AgPt Yolk-shell nanostructures with Au-GQDs yolk and AgPt alloy shell have been synthesized through a green wet chemical reduction method. In this process employed Au-GQDs as a yolk to obtain Au-GQDs@Ag nanoparticles (NPs), and then galvanic replacement reaction occurred between PtCl 6 2- and Ag to fabricate Au-GQDs@AgPt Yolk-shell nanostructures. GQDs served as a structure-directing and dispersing agent to prepare homogeneous shell. The electrocatalytic performance of the as-synthesized Au-GQDs@AgPt Yolk-shell nanostructures for methanol oxidation reaction (MOR) is studied by cyclic voltammetry (CV) and chronoamperometry (CA). The catalyst has displayed excellent specific activity (33.20 mA cm −2 ), which is approximately 7 times higher than those of commercial Pt/C. And its CO tolerance and stability for MOR are also greatly improved. The results attribute to their particular structure (Yolk-shell nanostructures), electron effect with Ag and Pt, electron transport between GQDs and AgPt shell. The present strategy can provide an environment-friendly and valuable way to fabricate multicomponent nanostructures with Yolk-shell nanostructures.
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高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Hui Wang,Cong-Hui Xu,Wei Zhao,Hong-Yuan Chen,Jing-Juan Xu
In clinical diagnosis, the level of biological enzymes in serum has been generally regarded as markers of human diseases. In this work, a kind of simple and sensitive plasmonic probe (indicated as Au@FeOOH) has been synthesized with the guidance of plasmonic imaging and subsequently developed for the alkaline phosphatase (ALP) level detection under dark-field microscopy (DFM). As a kind of hydrolysis enzyme, ALP can promote the hydrolysis of l-ascorbic acid 2-phosphate to ascorbic acid (AA). AA further acts as a strong reduction reagent for the decomposition of the FeOOH shell, which results in a blue shift of localized surface plasmon resonance spectra and an obvious color change under DFM. RGB analyses show that using a ΔR/G value instead of scattering wavelength or R/G value as the analytical signal, the deviation attributed to the size distribution of the initial Au NPs is greatly suppressed, and a linear range from 0.2 to 6.0 U/L (R2 = 0.99) and a limit of detection of 0.06 U/L are acquired with various concentrations of ALP during the detection. Besides, this approach exhibits excellent selectivity in complex biological serum samples, which is expected to be applied for the early diagnosis of clinical diseases by monitoring various biomarkers in the future.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Xiaoying Xiong,Qilong Zhang,Hui Yang
Composites composed of a polymer matrix and inorganic fillers have attracted tremendous attention owing to their promising application in flexible dielectric film capacitors. However, boosting the energy density while ensuring a high charging-discharging efficiency is still a huge challenge. In this work, Ba0.6Sr0.4TiO3 nanofibers (BST NFs) doped with different contents of ultra-fine Au nanoparticles are precisely prepared by one-step electrospinning, and P(VDF-TrFE-CFE) (PVTC)-based composites incorporated with various nanofibers are further prepared via a solution-casting process. A superior discharged energy density of 14.2 J/cm3 and an excellent energy storage efficiency of 71.3% have been achieved in such monolayer composites by optimizing the doping content and distribution of ultra-fine Au nanoparticles in BST NFs, which are induced by enhanced electric displacement and ensure suppressed energy loss and improved electric breakdown strength. Hence, doping moderate ultra-fine metal nanoparticles in one-dimensional inorganic nanofillers is a feasible strategy for designing polymer-based composites with outstanding performance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 40
·19065-19072
·
IF 3.591
Yandi Liu,Yijun Hao,Yingjiao Wu,Sha Lu,Juan Li,Zhijun Zhou
Owing to its excellent biocompatibility, abundant functional groups and injectability, the gellan hydrogel is widely used in the biomedical field. In this work, a Au/MnO2@GG nanocomposite hydrogel was prepared by a one-pot method using the gellan hydrogel as a template. The obtained Au/MnO2@GG exhibits a broad plasmon-enhanced absorption in the near-infrared region. As a result, the nanocomposite hydrogel has an enhanced photothermal conversion efficiency of 71.3% at 808 nm, superior to those of MnO2@GG (27.1%) and Au@GG (25.7%) alone. The local surface plasmon resonance induced by Au could transfer energy to MnO2, and thus improve the photothermal conversion efficiency through non-radiative energy dissipation. Moreover, the nanocomposite hydrogel displays excellent biocompatibility, long-term stability, good shear-thinning and self-recovery properties. In vivo antitumor studies proved that the nanocomposite hydrogel could completely ablate the solid tumors under NIR illumination. This work may encourage the development of more advanced nanocomposite materials with high photothermal conversion efficiency, stability, and multiple functionalities.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 7
·1-10
·
IF 5.833
Li Jingxian,Shan Xueling,Jiang Ding,Wang Wenchang,Xu Fangmin,Chen Zhidong
The combination of localized surface plasmon resonance (LSPR) and electrochemiluminescence (ECL) can be an effective way to amplify the signal intensity. In this work, an ECL aptasensor with 3,4,9,10-perylenetetracarboxylic acid–decorated cobalt phosphate (denoted as PTCA/CoP) as the ECL emitter and Au nanoparticles (NPs) as plasma was proposed for diclofenac assay. The prepared PTCA/CoP with special 1D/2D structure exhibited good ability and excellent ECL performance. The diclofenac aptamer acted as a bridge to link the PTCA/CoP and Au NPs; thus, the ECL performance of PTCA/CoP was greatly improved due to the plasma effect of Au NPs. Besides, it was found that the ECL signal of the aptasensor was obviously quenched by the introduction of diclofenac, which might be due to the transformation from the LSPR process to the resonance energy transform (RET) process. Under optimal conditions, the difference of ECL intensity was negatively correlated with the concentration of diclofenac in the range 0.1 pM to 10 μM with a low detection limit of 0.072 pM at the potential of −1.8 V vs. Ag/AgCl ( S / N = 3). The aptasensor was proved to be suitable for the detection of diclofenac in real samples, suggesting its great practicability. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）