ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Rongli Zhang,Ye Zhu,Jing Huang,Sheng Xu,Jing Luo,Xiaoya Liu
The electrophoretic deposition (EPD) of self-assembled nanoparticles (NPs) on the surface of an electrode is a new strategy for preparing sensor coating. By simply changing the deposition conditions, the electrochemical response for an analyte of deposited NPs-based coating can be controlled. This advantage can decrease the difference between different batches of sensor coating and ensure the reproducibility of each sensor. This work investigated the effects of deposition conditions (including deposition voltage, pH value of suspension, and deposition time) on the structure and the electrochemical response for l-tryptophan of sensor coating formed from Au-doped poly(sodium γ-glutamate) with pendant dopamine units nanohybrids (Au/γ-PGA–DA NBs) via the EPD method. The structure and thickness of the deposited sensor coating were measured by atomic force microscopy, which demonstrated that the structure and thickness of coating can be affected by the deposition voltage, the pH value of the suspension, and the deposition time. The responsive current for l-tryptophan of the deposited sensor coating were measured by differential pulse voltammetry, which showed that the responsive current value was affected by the structure and thickness of the deposited coating. These arguments suggested that a rich design-space for tuning the electrochemical response for analyte and a source of variability in the structure of sensor coating can be provided by the deposition conditions. When Au/γ-PGA–DA NBs were deposited on the electrode surface and formed a continuous coating with particle morphology and thinner thickness, the deposited sensor coating exhibited optimal electrochemical response for l-tryptophan.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·6750-6755
·
IF 3.201
Shao Su,Zaiwei Lu,Jing Li,Qing Hao,Wei Liu,Changfeng Zhu,Xizhong Shen,Jiye Shi,Lianhui Wang
Herein, a nonenzymatic electrochemical biosensor for glucose detection was developed based on an Au@Pt core–shell nanoparticle-decorated MoS2 (MoS2–Au@Pt) nanohybrid. Such designed MoS2-based nanohybrid possessed the advantages of MoS2 nanosheets with a large surface area and noble bimetallic nanoparticles with high catalytic ability, making the MoS2–Au@Pt nanocomposite modified electrode exhibit excellent electrocatalytic activity toward the oxidation of glucose due to their synergistic effect. As expected, the MoS2-based electrochemical biosensor showed a wide linear response over glucose concentration ranging from 10 μM to 3 mM with a low detection limit of 1.08 μM (S/N = 3). Furthermore, the as-prepared electrochemical biosensor also showed excellent selectivity and stability, which could be employed to determine glucose in real samples with acceptable results. The MoS2-Au@Pt nanohybrid could be a promising candidate material for the construction of a high performance sensing platform for chemical/biological molecule detection.
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RSC Advances
·
2017
·Vol. 7
·期 87
·55215-55223
·
IF 3.108
Gengwei Zhang,Yang Zhou,Zhao Ding,Likang Fu,Shixing Wang
A new adsorbent thiosemicarbazide/nanosilica composite was synthesized via a facile two-step reaction, including the functionalization of silica nanoparticles via amino groups, and crosslinking the thiosemicarbazide with glutaraldehyde onto the amino functionalized silica nanoparticles. The adsorption capability of the adsorbent for Au(III) ions was investigated. Fourier transform infrared, X-ray photoelectron spectroscopy and thermogravimetric analysis were used to characterize the adsorbent. Experimental results indicated that nanocomposites exhibited highly selective and efficient adsorption for Au(III). The equilibrium data fitted well with the Langmuir isotherm and the obtained kinetic data obeyed the pseudo-second-order kinetics model. The maximum adsorption capacity was 4.3 mmol g−1 at pH 2. The adsorbent can still keep high adsorption capability after five recycling rounds. The adsorption mechanisms were proposed as the synergistic effect of ionic interaction and chelation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Xiao-Bing Qian,Wen Peng,Yi-Biao Shao,Jian-Hua Huang
Nickel oxide/Au porous nanobelts were synthesized by hydrolysis of nickel (II) sulfate in the presence of Au nanoparticles under hydrothermal condition and subsequent calcination of Ni(OH) 2 /Au precursor in air. XPS measurement indicated the existence of both NiO and Ni 2 O 3 in nickel oxide/Au porous nanobelts. Heterojunctions between NiO and Ni 2 O 3 , as well as between NiO and Au, were observed in HRTEM images. Under visible light irradiation (λ > 420 nm), nickel oxide/Au porous nanobelts effectively produced hydrogen from water in the presence of Na 2 S and Na 2 SO 3 as sacrificial electron donor . The highest rate of hydrogen production over nickel oxide/Au porous nanobelt was 38.5 times higher than that of commercial NiO loaded with the same amount of Au. The photoluminescence spectra and transient photocurrent responses of nickel oxide/Au nanobelts reveal that the improved photocatalytic activity is due to the increased electron–hole separation at NiO Ni 2 O 3 and NiO Au interfaces. This work shows that low-cost nickel oxide could be used as visible light-active photocatalyst for hydrogen production.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Conghui Liu,Haifeng Dong,Nianqiang Wu,Yu Cao,Xueji Zhang
Reactive oxygen species generation efficiency of photosensitizers and hypoxia microenvironment in solid tumor hamper photodynamic therapy (PDT) efficacy. Here, we introduce an efficient inorganic photosensitizer by incorporating plasmonic gold metal nanostructures into Cu2O semiconductors for PDT. By utilizing the plasmon-induced resonance energy transfer (PIRET) process from Au to Cu2O, Au@SiO2@Cu2O (ASC) demonstrates a high singlet oxygen quantum yield of 0.71 under a 670 nm laser irradiation. The ASC is loaded into oxygen self-enriched perfluorohexane (PFH) droplets and coated with liposome (Lip) to form Lip(ASC/PFH) nanocomposites. The achieved Lip(ASC/PFH) shows considerable anticancer efficacy for in vitro cancer cells and in vivo tumor growth. The proposed oxygen self-enriched PIRET-PDT concept has significant implication in PDT design.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Bin Zhang,Shuo Liu,Hao Deng,Ye Pei,Qingxue Mu,Yuming Lei,Taolei Sun,Guanbin Gao
Plasmonic metal and semiconductor heterostructures have recently emerged as a promising strategy to enhance the rate of catalyzed reactions. However, most research has predominantly focused on plasmon-induced hot electron transfer mediated by localized surface plasmon resonance (LSPR), while the photothermal effects of plasmonic metals have been largely underexplored. In this study, a dumbbell-shaped Au nanobipyramids (AuNBPs)/CeO2 heterojunction with superior photothermal properties was designed as a catalytic platform for the hydrolysis of organophosphorus compounds and the reduction of 4-nitrophenol (p-NP). The results demonstrated that the photothermal effect at the interface between AuNBPs and CeO2 is the dominant mechanism accelerating the reaction. Moreover, for the hydrolysis product p-NP, AuNBPs@CeO2 further converted it into 4-aminophenol (p-AP) in the presence of NaBH4, effectively preventing secondary pollution. In summary, the integration of AuNBPs with photothermal properties and CeO2 successfully achieved cascade catalytic degradation of organophosphates.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Baihe Sun,Guanghui Li,Yue Wu,Junwei Gai,Min Zhu,Weiwei Ji,Xiaoying Wang,Fenghua Zhang,Wanting Li,Jingjin Hu,Yuxin Lou,Gusheng Feng,Xijun Han,Jinwen Dong,Jiayuan Peng,Jiawei Pei,Yakun Wan,Yanfei Li,Linlin Ma
Apolipoprotein A1 (Apo-A1) is a well-recognized biomarker in tissues, closely associated with cardiovascular diseases such as atherosclerosis, coronary artery disease, and heart failure. However, existing methods for Apo-A1 determination are limited by costly equipment and intricate operational procedures. Given the distinct advantages of electrochemical immunosensors, including affordability and high sensitivity, along with the unique attributes of nanobodies (Nbs), such as enhanced specificity and better tissue permeability, we developed an electrochemical immunosensor for Apo-A1 detection utilizing Nb technology. In our study, Ce-MOF@AuNPs nanocomposites were synthesized by using ultrasonic methods and applied to modify a glassy carbon electrode. The Nb6, screened from an Apo-A1 immunized phage library, was immobilized onto the nanocomposite material, establishing a robust binding interaction with Apo-A1. The recorded peak current values demonstrated a logarithmic increase corresponding to Apo-A1 concentrations ranging from 1 to 100,000 pg/mL, with a detection limit of 36 fg/mL. Additionally, the developed immunosensors demonstrated high selectivity, good stability, and reproducibility. Our methodology was also effectively utilized for serum sample analysis, showing good performance in clinical assessments. This electrochemical immunosensor represents a promising tool for Apo-A1 detection, with significant potential for advancing cardiovascular disease diagnostics.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Liuqing Li,Yaping Wang,Yu Ruan,Tiefeng Xu,Shaoyi Wu,Wangyang Lu
The photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is important to facilitate the conversion of biomass into high-value compounds under mild conditions. This study developed Au/TiO 2 catalysts through the urea deposition method, subsequently integrating them with iron phthalocyanine (FePc) via ball milling, resulting in FePc/Au-TiO 2 . These catalysts were calcined at various temperatures. The results indicated that Au nanoparticles are uniformly dispersed on TiO 2 , and Fe in FePc/Au TiO 2 calcined at 410 °C mainly exists in the form of ferrosoferric oxide (Fe 3 O 4 ). FePc/Au-TiO 2 with 30 % FePc which calcined at 410 °C demonstrated outstanding photocatalytic activity, achieving a 97 % yield of FDCA. The effects of various experimental parameters on the conversion of HMF to FDCA were investigated, such as the calcination temperatures, the FePc amount, base, and catalyst dosage. Electron paramagnetic resonance and active species capture tests revealed the catalyst can convert O 2 into •O 2 – and 1 O 2 through excited electrons and photogenerated holes. This study highlights the role of interfacial coupling interactions in boosting catalytic performance, offering a novel approach for photocatalyst development in converting HMF to FDCA.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 3.7
Xiaohua Zhao,Xiaoxiao Liu,Xiang Liu,Weiyi Li,Ping Wang
Integration of localized surface plasmon resonance (LSPR) metallic nanocrystals into photocatalysis is an intriguing approach for light-driven organic transformations. However, uncertain direction of hot carriers is a grand challenge, which fails to take full advantage of the LSPR excitation. In this work, core–shell gold@ceria nanosphere–supported segregated palladium species (Au@CeO 2 –Pd) have developed to steer the light absorption capability and charge carrier migration. Under simulated solar light irradiation, the core–shell–satellite Au@CeO 2 –Pd exhibited efficient light harvesting and colossal activity in the Suzuki coupling reaction. The plasmon-induced hot electrons overpassed the Schottky barrier at the Au@CeO 2 interfaces and migrated from Au core to CeO 2 shell accordingly. Subsequently, the photogenerated electrons and hot electrons migrated from Au@CeO 2 core–shells to Pd, which acted as an electron acceptor. Detailed photocatalytic mechanism studies revealed that both photoexcited electrons and holes were the main active species involved in the photocatalytic Suzuki coupling reaction process. In particular, the diphenyl yield over Au@CeO 2 –Pd catalyst was ~1.7 times higher than that of core–shell–satellite Au@SiO 2 –Pd, where a 19-nm-thick SiO 2 shell was introduced to prevent the migration of hot electrons. This distinctly certified that the hot electrons transfer in the core–shell–satellite Au@CeO 2 –Pd under illumination played an important role to drive Suzuki reaction. Overall, this design of core–shell–satellite Au@CeO 2 –Pd plasmonic photocatalyst has the potential in the field of photo-driven organic transformations.
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SENSORS
·
2024
·Vol. 24
·期 7
·2110
·
IF 3.4
Yinfeng Shen,Yiping Liu,Chao Fan,Qudong Wang,Ming Li,Zhi Yang,Liming Gao
The mature processes of metal oxide semiconductors (MOS) have attracted considerable interest. However, the low sensitivity of metal oxide semiconductor gas sensors is still challenging, and constrains its practical applications. Bimetallic nanoparticles are of interest owing to their excellent catalytic properties. This excellent feature of bimetallic nanoparticles can solve the problems existing in MOS gas sensors, such as the low response, high operating temperature and slow response time. To enhance acetone sensing performance, we successfully synthesized Au-Pd/ZnO nanorods. In this work, we discovered that Au-Pd nanoparticles modified on ZnO nanorods can remarkably enhance sensor response. The Au-Pd/ZnO gas sensor has long-term stability and an excellent response/recovery process. This excellent sensing performance is attributed to the synergistic catalytic effect of bimetallic AuPd nanoparticles. Moreover, the electronic and chemical sensitization of noble metals also makes a great contribution. This work presents a simple method for preparing Au-Pd/ZnO nanorods and provides a new solution for the detection of acetone based on metal oxide semiconductor.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 12
·2925
·
IF 4.2
Chongchong Ma,Yixuan Wen,Yuqing Qiao,Kevin Z. Shen,Hongwen Yuan
This article reports a simple hydrothermal method for synthesizing nickel disulfide (NiS2) on the surface of fluorine-doped tin oxide (FTO) glass, followed by the deposition of 5 nm Au nanoparticles on the electrode surface by physical vapor deposition. This process ensures the uniform distribution of Au nanoparticles on the NiS2surface to enhance its conductivity. Finally, an Au@NiS2-FTO electrochemical biosensor is obtained for the detection of dopamine (DA). The composite material is characterized using transmission electron microscopy (TEM), UV-Vis spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical properties of the sensor are investigated using cyclic voltammetry (CV), differential pulse voltammetry (DPV), and time current curves in a 0.1 M PBS solution (pH = 7.3). In the detection of DA, Au@NiS2-FTO exhibits a wide linear detection range (0.1~1000 μM), low detection limit (1 nM), and fast response time (0.1 s). After the addition of interfering substances, such as glucose, L-ascorbic acid, uric acid, CaCl2, NaCl, and KCl, the electrode potential remains relatively unchanged, demonstrating its strong anti-interference capability. It also demonstrates strong sensitivity and reproducibility. The obtained Au@NiS2-FTO provides a simple and easy-to-operate example for constructing nanometer catalysts with enzyme-like properties. These results provide a promising method utilizing Au coating to enhance the conductivity of transition metal sulfides.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 11
·1-12
·
IF 2.5
Liu Hang,Tian Siye,Liu Yanchang,Liu Junlong,Qu Zhihao,Zhang Yuhong
In this paper, Zn 2 SnO 4 -SnO 2 -ZnO (ZSO) cubic nanomaterials are prepared by a hydrothermal method, and then ZSO composites with Au nanoparticles are prepared by a water bath heating method. The Au/ZSO nanomaterials are characterized by XRD, XPS, SEM and TEM. The results of XRD and XPS shows that the prepared samples have no other impurities, and also prove the existence of Au. The cubic structure of the sample was observed by SEM. The lattice spacings of Zn 2 SnO 4 , ZnO, SnO 2 and Au were calculated from TEM images. The gas sensing properties of pure ZSO and Au/ZSO nanocomposites are compared. At the optimum working temperature of 240 °C, the response of 3%Au/ZSO nanocomposite to 100 ppm triethylamine (TEA) is as high as 1595.5. Lower detection limit is as low as 3 ppm with a response value of 35.3. Importantly, this paper proposes an efficient method for preparing Au nanoparticles supported on ZSO and a gas sensor with high sensitivity response to TEA.
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