RSC Advances
·
2020
·Vol. 10
·期 38
·22616-22621
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IF 3.119
Liren Wang,Han Wang,Yanming Liu,Xinyu Wang,Peng Tao,Wen Shang,Benwei Fu,Chengyi Song,Tao Deng
This paper introduces an approach to synthesize bimetallic nanoparticles under an alternating temperature field in aqueous solution. During the synthesis, pyro-catalytic barium titanate is used as the substrate to reduce the metallic ions dispersed in the solution due to the generated charges at the surface of pyro-materials under temperature oscillation. Chloroauric acid and potassium tetrachloroplatinate are used as precursors to produce gold/platinum bimetallic nanoparticles through a pyro-catalytic process. Transmission electron microscopy characterization, in combination with energy dispersive X-ray spectroscopy mapping, demonstrates that the bimetallic nanoparticle is composed of an Au core and Au/Pt alloy shell structure. Compared to the conventional approaches, the pyroelectric synthesis approach demonstrated in this work requires no toxic reducing agents and waste heat can be used as a thermal energy source in the synthesis. Hence, it offers a potential “green” synthetic method for bimetallic nanoparticles.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jiangjiexing Wu,Kang Qin,Dan Yuan,Jun Tan,Li Qin,Xuejin Zhang,Hui Wei
One of the current challenges in nanozyme-based nanotechnology is the utilization of multifunctionalities in one material. In this regard, Au@Pt nanoparticles (NPs) with excellent enzyme-mimicking activities due to the Pt shell and unique surface plasmon resonance features from the Au core have attracted enormous research interest. However, the unique surface plasmon resonance features from the Au core have not been widely utilized. The practical problem of the optical-damping nature of Pt hinders the research into the combination of Au@Pt NPs’ enzyme-mimicking properties with their surface-enhanced Raman scattering (SERS) activities. Herein, we rationally tuned the Pt amount to achieve Au@Pt NPs with simultaneous plasmonic and enzyme-mimicking activities. The results showed that Au@Pt NPs with 2.5% Pt produced the highest Raman signal in 2 min, which benefited from the remarkably accelerated catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine with the decorated Pt and strong electric field retained from the Au core for SERS. This study not only demonstrates the great promise of combining bimetallic nanomaterials’ multiple functionalities but also provides rational guidelines to design high-performance nanozymes for potential biomedical applications.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2021
·Vol. 47
·期 10
·4051-4066
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IF 2.914
Chen Rong,Yi Guohui,Wu Songshuai,Meng Chuangang
Well-dispersed Au–Pt alloyed bimetallic nanoparticles are synthesized using chlorogenic acid as the only reducing agent and stabilizer to reduce Au/Pt precursors successively has been presented here. The shapes of Au–Pt bimetallic nanoparticles are controlled by changing the sequence of successive reduction: the spherical shape in the sequence of Pt precursor reduced prior to Au precursor, and the flower shape by reversing the sequence. The sizes of Au–Pt bimetallic nanoparticles can be tuned by changing the molar ratios of the precursors to chlorogenic acid, and the average size of Au–Pt bimetallic nanoparticles decreased or increased with an increase in chlorogenic acid concentration in different sequence of successive reduction. Additionally, the high antioxidant activity of Au–Pt bimetallic nanoparticles was verified by in vitro radical scavenging assays. Our results show that chlorogenic acid is an excellent reducing and capping agent for the controlled synthesis and stabilization of Au–Pt bimetallic nanoparticles, which could be extended to reduce other metal precursors for synthesizing bimetallic and trimetallic nanoparticles. These shape-controlled and size-tunable Au–Pt bimetallic nanoparticles by chlorogenic acid will expand their biomedical applications in future. Graphic abstract
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Lei Jiao,Zonggang Mu,Chengzhou Zhu,Qin Wei,He Li,Dan Du,Yuehe Lin
A dual enhancing strategy has been employed to develop electrochemical immunosensor for the ultrasensitive detection of AFP, which is enhanced by poly-dopamine functionalized N-doped multi-walled carbon nanotube (PDA-N-MWCNT) and the nanocomposite of graphene loaded Au@Pt mesoporous nanodendrites. The fabricated immunosensor exhibited a wide linear range of 0.1 pg/mL–10 ng/mL, with an ultralow detection limit of 0.05 pg/mL. The good performance of the developed immunosensor could be contributed to (1) PDA-N-MWCNT supplied good biocompatible surface for immobilizing primary antibody (Ab 1 ); (2) PDA-N-MWCNT modified electrode endowed more electrochemical active area, which can effectively improve the sensitivity of the immunosensor; (3) graphene could load high amount of good conductive and high electrocatalytic active Au@Pt nanodendrites for signal amplification . The results imply that the as-fabricated immunosensors have great potential for clinic usage.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Mengyao Qi,Yi Ke,Yifei Li,Peng Li,Huakuo Zhou,Xia Zhang,Jieshi Chen,Jun Meng
Hyaluronidase (HAase), is a naturally occurring glycosidase with the ability to break down glycosidic bonds within hyaluronic acid (HA) chains. In this paper, we propose a portable smartphone and Surface-enhanced Raman scattering (SERS) dual-mode sensor based on Au@Pt nanozyme coated with HA hydrogel to realize sensitive detection of HAase. Au@Pt nanozyme has excellent peroxidase-like activity, oxidase-like activity and catalase-like activity under acidic conditions. When HAase is present, the hydrogel structure of HA was hydrolyzed and gradually released Au@Pt nanozyme. The released Au@Pt nanozyme is used to catalyze the hydrogen peroxide system, so that 3,3′,5,5′-tetramethylbenzidine (TMB) can be oxidized into blue 3,3′,5,5′-tetramethylbenzidine (TMB ox ). Therefore, based on the above strategies, a dual-mode sensing platform for HAase detection by smartphone and SERS was established. The linear range of the dual-mode sensor platform are 2–30 U/mL and 2–80 U/mL, and the detection limits are 1.0386 U/mL and 0.004 U/mL, respectively. The dual-mode smartphone and SERS sensor platform, a combination of smartphone and Raman spectrometer, is successfully further applied to biological urine samples. This portable dual-mode sensor based on intelligent hydrogel coated nanozyme not only opens up a new way for instant detection, but also has potential applications in clinical diagnosis.
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MATERIALS LETTERS
·
2011
·
IF 2.12
Youwei Chen,Wei Guo Wang,Shenghu Zhou
Au–Pt bimetallic nanoparticles (NPs) were synthesized by a seeded growth method. Au NPs with different sizes were obtained by reducing HAuCl 4 with butyllithium, and AuPt bimetallic NPs were synthesized by reducing H 2 PtCl 6 with oleylamine using the pre-synthesized Au NPs as seeds. The size of Au seeds was found to be a key factor on the structure of Au–Pt bimetallic NPs. Using big Au NP seeds (8 nm or 12 nm) resulted in the formation of Au–Pt dendritic structures. While relatively small Au NPs (3 nm) were used as seeds, the fast atomic diffusion inside relatively small bimetallic NPs will result in an Au–Pt alloy formation.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Runzan Zhang,Xianya Qin,Junyu Lu,Hongbo Xu,Siyu Zhao,Xiaonan Li,Conglian Yang,Li Kong,Yuanyuan Guo,Zhiping Zhang
In recent years, microbiota-based tumor immunotherapy has become a hotspot in cancer research. However, the use of microorganisms alone to activate the immune response for antitumor therapy was unsatisfactory. In this study, we biosynthesized gold nanoparticles (AuNPs) and platinum nanoparticles (PtNPs) based on yeast microcapsules to activate the immune response for antitumor treatment in synergy with chemodynamic therapy (CDT) and photothermal therapy (PTT). We generated AuNPs and PtNPs on yeast microcapsules (YAP) and fabricated nanoscale particles (Bre-YAP) by ultrasonic fragmentation and differential centrifugation. Bre-YAP retained the glucan component of yeast as an adjuvant; in the meantime, these two kinds of metal nanoparticles contained were excellent CDT and PTT mediators. By inspection, they could reach a high level of distribution in tumors and tumor-draining lymph nodes (TDLNs). Under the laser irradiation of tumors, this immunological nanomaterial significantly remodeled the microenvironments of tumors and TDLNs. The primary tumors were effectively inhibited or even eradicated, and the overall survival of mice was significantly improved as well. Therefore, yeast microcapsule-based Bre-YAP with immune properties could be used as an effective cancer treatment modality.
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Nanomaterials
·
2022
·Vol. 12
·期 18
·3221
·
IF 5.719
Wanzhen Meng,Yunrui Zhao,Dujuan Dai,Qianqian Zhang,Zeyan Wang,Yuanyuan Liu,Zhaoke Zheng,Hefeng Cheng,Ying Dai,Baibiao Huang,Peng Wang
Efficient and low-cost degradation of ethylene has always been a difficult problem in the storage and transportation of fruits and vegetables. Although photocatalysis is considered to be a feasible and efficient solution for ethylene degradation, the low degradation ability of conventional catalysts for small non-polar molecules limits its application. TiO2has the advantage of tunable microstructure, but it also has the defects of wide band gap and low utilization of sunlight. The surface plasmon resonance (SPR) effect of noble metals can effectively improve the visible light absorption range of catalysts, and the synergy of noble metals further enhances the photocatalytic ability. Herein, we developed a series of AuPt catalysts through the photo-deposition method. Benefited from the SPR effect and the synergy of Au and Pt, the efficiency of AuPt–TiO2was 19.9, 4.64 and 2.42 times that of TiO2, Au–TiO2and Pt–TiO2, and the photocatalytic degradation ability of AuPt–TiO2was maintained in five cyclic stability tests. Meanwhile, the transient photocurrent spectra and PL spectra proved that the light absorption capacity and carrier separation efficiency of AuPt–TiO2were enhanced. This work provides a new direction for enhancing non-polar small-molecule photodegradation of semiconductors.Keywords:surface plasmon resonance;Au–Pt nanoparticles;synergy;non-polar small molecules;photodegradation
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Qianqian Duan,Jialin Wang,Boye Zhang,Xiaoyuan Wang,Juanjuan Xue,Wendong Zhang,Shengbo Sang
As an emerging cancer treatment strategy, photothermal therapy (PTT) is precise, controllable, minimally invasive, low cost and less toxic side effects, thus photothermal transduction agents have been extensively investigated in recent years. Noble metal nanomaterials with unique localized surface plasmon resonance (LSPR) effects are particularly suitable as photothermal transduction agent, but the currently developed precious noble metal nano photothermal transduction agents face serious problems such as complex synthesis process, poor photothermal performance and high biotoxicity. Moreover, the large amount of reactive oxygen species (ROS) produced during PTT treatment could cause irreversible damage to the healthy tissues surrounding the tumor. In this work, we deposited platinum (Pt) on the tips of gold nanorods (AuNRs) to form dumbbell-shaped Au-Pt bimetallic nanorods (AuPtNRs), and functionalized AuPtNRs with biocompatible polydopamine (PDA) to obtain [email protected] With 808 nm laser irradiation, the prepared [email protected] exhibited excellent photothermal stability, and its photothermal conversion efficiency (PCE) reached 81.78%, which was significantly higher than that of AuNRs (52.32%) and AuPtNRs (78.76%). With low cytotoxicity, [email protected] decreased cell viability from 91.12% to 39.36% after PTT on cancer cells in vitro, while significantly reducing intracellular ROS levels generated by heat stress. Therefore, the excellent photothermal properties, high cancer cell killing and ROS scavenging activity of [email protected] in PTT could be an ideal candidate for improving therapeutic efficacy while reducing the risk of toxic side effects due to heat stress-induced ROS formation.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 8
·B562
·
IF 3.12
Long Wu,Heng Yan,Jing Wang,Guojiao Liu,Weihong Xie
Based on tyrosinase modified Au-Pt@SiO2/Au-graphene (APS/Au-GN) electrode, a highly sensitive biosensor was developed for the direct electrochemical detection of bisphenol A (BPA) in food matrices. In this work, Au-graphene (Au-GN), Au-Pt@SiO2 nanocomposites (APS NPs) and tyrosinase (Tyr) were subsequently cast on glass carbon electrode (GCE) via the electrostatic interaction and Van der Waals force. The self-assembled APS NPs and Tyr were decorated on Au-GN forming a new hierarchical three dimensional nanostructure. Due to the dense Au/Pt dots distributed on silica nanoparticles, APS NPs could behave excellent catalytic activity and stability. In this regard, BPA could be sensitively detected by square wave voltammetry (SWV) and differential pulse voltammetry (DPV) with well-defined oxidation peaks at 480 mV and 660 mV, respectively. Under the optimal conditions, SWV detection behaved good analytical performance toward BPA with a wide linear response ranging from 0.01 mg L−1 to10 mg L−1. The detection limit of APS/Au-GN/GCE for BPA was 1.80 μg L−1 (S/N = 3). Moreover, the method showed good reproducibility in practical samples with recoveries from 87.4% to 110.7%, suggesting its potential application in food analysis and safety verification.
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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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ANALYTICAL SCIENCES
·
2020
·Vol. 36
·期 9
·1045-1051
·
IF 2.049
Ze WANG,Bin DONG,Xiaoqian CUI,Qian FAN,Yanfu HUAN,Hongyan SHAN,Guodong FENG,Qiang FEI
In this study, core-shell Au@Pt nanoparticles (Au@Pt NPs) with peroxidase catalytic activity were synthesized by the seed-mediated method, and were used to catalyze the reaction of luminol–H2O2 to enhance the chemiluminescence (CL) intensity. It was found that thiocyanate (SCN−) can effectively inhibit the catalytic activity of Au@Pt NPs. Based on this phenomenon, a method to detect SCN− by using the Au@Pt NPs-catalytic luminol–H2O2 CL system was established, which has an ultra-low detection limit and an ultra-wide linear range, as well as the advantages of being simple and having low-cost and convenient operation. The research mechanism indicated that SCN− could be adsorbed on the surface of Au@Pt NPs and occupies the active sites of Pt nanostructures, which led to a decrease in the amount of Pt0 and a loss of the excellent catalytic activity of Au@Pt NPs. After optimizing the experimental conditions, this assay for detecting SCN− exhibited a good linear range from 5 to 180 nM, and the low detection limit was 2.9 nM. In addition, this approach has been successfully applied to the detection of SCN− in tap-water samples, which has practical application value and embodies good development prospects.
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