NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215201
·
IF 3.551
Xu Han,Jie Xing,Hong Xu,Yuan Huang,Danyang Li,Jinghao Lu,Penghui Li,Yibing Wu
The development of photoelectric devices for high integration and miniaturization in the semiconductor industry can be pushed forward by the thriving research of two-dimensional layered metal dichalcogenides (2D-LMDs). SnS2 nanosheets have an evident photoresponse to both ultraviolet and partial visible light, but only with a fair photoelectric performance limited by their atomic-layer thickness. Here, we report a convenient and simple method to dramatically enhance the electrical and photoelectric performance of the SnS2 flake. By integrating SnS2 with Au plasmonic nanostructures, the photocurrent (Iph) increased by over 20 times. The corresponding responsivity (R), light gain (G), and detectivity (D*) have been improved by ∼2200%, 2200% and 600%, respectively. The responsivity and detectivity of the Au NPs-SnS2 field-effect transistor (FET) at 532 nm are 1125.9 A W−1 and 2.12 × 1011 Jones. Though atomically thin, the hybrid SnS2 photodetector, benefiting from local surface plasmonic resonance, achieves an excellent photoelectric performance that is not usually possible with a pristine SnS2-only device.
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ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Siqing Liu,Liping Chen,Xingju Li,Ruxi Lin,Yunxin Zhang,Xiaojun Luo
Background β 2 −agonists, also known as β 2 −adrenoceptor agonists, are secreted by the adrenal medulla of the animal body and have a characteristic catecholamine structure. When inhaled, the drug rapidly relaxes the smooth muscles of the airways in asthma patients, improves ventilation, and temporarily increases alertness during exercise and helps relieve fatigue. However, the use of β 2 −agonists to improve physical performance in a short period of time can lead to extreme dependence and irritation, and there are still many unknown hazards. They are now on the World Anti−Doping Organization (WADA) prohibited list. Results Surface−enhanced Raman spectroscopy (SERS) can directly detect the characteristic peaks associated with β 2 −agonist compounds in a fast and sensitive manner. This study is the first to utilize a direct Raman detection technique, achieving successful acquisition of the fingerprint spectra of three target analytes (vilanterol, fenoterol, bambuterol) as well as the establishment of a corresponding fingerprint spectral analysis method. To further improve its performance, in this study, gold nanoparticles were synthesized via redox methods and integrated with covalent organic framework (COF) to construct a novel highly sensitive detection platform for β 2 −agonists. The Au−COF composite exhibits high adsorption performance and can significantly enhance the SERS signal of the target, thereby achieving low detection limits, including 9.25 × 10 −6 g·mL −1 for bambuterol, 9.76 × 10 −6 g·mL −1 for vilanterol, and 7.54 × 10 −6 g·mL −1 for fenoterol, which makes it promising for improving the overall sensitivity of β 2 −agonist detection. Significance This study develops a novel analytical method utilizing Au−COF composites for highly sensitive SERS detection. It pioneers the application of this strategy in the qualitative and quantitative analysis of trace β2-agonists. The research not only significantly expands the scope of Au−COF composites but also provides a technologically promising approach with substantial practical value for ensuring medical safety through clinical medication monitoring and for detecting banned substances in sports.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Minghui Zhou,Xiaoli Liu,Baozhi Yu,Jing Cai,Chunyan Liao,Zhenhua Ni,Zhongyue Zhang,Zhaoyu Ren,Jintao Bai,Haiming Fan
Surface-enhanced Raman scattering (SERS) technology has been investigated for long time because of its tremendous potential in chemical and biomolecular detection. One of the challenging works in this field is to fabricate fantastic substrates with high sensitivity, stability, and reproducibility. This work reports a novel SERS substrate based on MnO 2 /Au hybrid nanowall film prepared by simple and cheap hydrothermal method combined with subsequent vacuum thermal evaporation process. Enhanced SERS enhancement factor (EF) with increased thickness of gold layer was observed and a significant increase of EF up to 8 orders of magnitude has been achieved. Finite-difference time-domain (FDTD) simulations have been carried out to elucidate the origin of the enhancement and the distribution of the “hot spots”. Experimental evidences indicate that the as-prepared substrate possesses excellent SERS sensitivity, good stability and high reproducibility. Our results provide a novel MnO 2 /Au hybrid nanowall film as a convenient and robust SERS-active substrate for detecting biomolecules.
研究领域:
材料科学
·
纳米技术
·
分析化学
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拉曼光谱学
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ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 22
·1700016
·
IF 12.124
Xingzhong Zhu,Henglei Jia,Xiao-Ming Zhu,Si Cheng,Xiaolu Zhuo,Feng Qin,Zhi Yang,Jianfang Wang
The synthesis of anisotropic metal nanostructures is strongly desired for exploring plasmon-enabled applications. Herein, the preparation of anisotropic Au/SiO 2 and Au/SiO 2 /Pd nanostructures is realized through selective silica coating on Au nanobipyramids. For silica coating at the ends of Au nanobipyramids, the amount of coated silica and the overall shape of the coated nanostructures exhibit a bell-shaped dependence on the cationic surfactant concentration. For both end and side silica coating on Au nanobipyramids, the size of the silica component can be varied by changing the silica precursor amount. Silica can also be selectively deposited on the corners or facets of Au nanocubes, suggesting the generality of this method. The blockage of the predeposited silica component on Au nanobipyramids enables further selective Pd deposition. Suzuki coupling reactions carried out with the different bimetallic nanostructures functioning as plasmonic photocatalysts indicate that the plasmonic photocatalytic activity is dependent on the site of Pd nanoparticles on Au nanobipyramids. Taken together, these results suggest that plasmonic hot spots play an important role in hot-electron-driven plasmonic photocatalysis. This study opens up a promising route to the construction of anisotropic bimetallic nanostructures as well as to the design of bimetallic plasmonic-catalytic nanostructures as efficient plasmonic photocatalysts.
研究领域:
纳米材料
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等离激元学
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光催化
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材料化学
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纳米技术
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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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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Junyi Zeng,Caiping Ding,Liang Chen,Bing Yang,Ming Li,Xiaoyuan Wang,Fengmei Su,Chuntai Liu,Youju Huang
Most enzyme catalysts are unable to achieve effective oxidation resistance because of the monotonous mimicking function or production of secondary reactive oxygen species (ROS). Herein, the Au@Cu2O heterostructure with multienzyme-like activities is deigned, which has significantly improved antioxidant capacity compared with pure Cu2O for the scavenging of highly cell-damaging secondary ROS, i.e.,·OH. Experiments and theoretical calculations show that the heterostructure exhibits a built-in electric field and lattice mismatch at the metal–semiconductor interface, which facilitate to generate abundant oxygen vacancies, redox couples, and surface electron deficiency. On the one hand, the presence of rich oxygen vacancies and redox couple can enhance the adsorption and activation of oxygen-containing ROS (including O2·– and H2O2). On the other hand, the electron transfer between the electron-deficient Au@Cu2O surface and electron donor would promote peroxide-like activity and avoid producing ·OH. Importantly, endogenous ·OH could be eliminated in both acidic and neutral conditions, which is no longer limited by the volatile physiological environment. Therefore, Au@Cu2O can simulate superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and glutathione peroxidase (GPx) to form a complete antioxidant system. The deigned nanoenzyme is explored in the real sample world such as A549 cells and zebrafish. This work provides theoretical and practical strategies for the construction of a complete antioxidant enzyme system.
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Materials
·
2023
·Vol. 16
·期 2
·868
·
IF 3.4
Kai Zhang,Kehao Zhang,Yuxiang Ma,Hailong Wang,Junyong Shao,Mingliang Li,Gang Shao,Bingbing Fan,Hongxia Lu,Hongliang Xu,Rui Zhang,Huanhuan Shi
TiO2/Au/BDD composites with a Z-scheme structure was prepared by orderly depositing gold (Au) and titanium dioxide (TiO2) on the surface of a boron-doped diamond (BDD) film using sputtering and electrophoretic deposition methods. It was found that the introduction of Au between TiO2and the BDD, not only could reduce their contact resistance, to increase the carrier transport efficiency, but also could improve the surface Hall mobility of the BDD electrode. Meanwhile, the designed Z-scheme structure provided a fast channel for the electrons and holes combination, to promote the effective separation of the electrons and holes produced in TiO2and the BDD under photoirradiation. The electrochemical characterization elucidated that these modifications of the structure obviously enhanced the electrocatalytic performance of the electrode, which was further verified by the simulated wastewater degradation experiments with reactive brilliant red X-3B. In addition, it was also found that the photoirradiation effectively enhanced the pollution degradation efficiency of the modified electrode, especially for the TiO2/Au/BDD-30 electrode.Keywords:boron-doped diamond;TiO2;Z-scheme;electrocatalysis;wastewater treatment
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Biomaterials Advances
·
2022
·
IF 0
Hua Tian,Jixuan Hong,Changgui Li,Yuheng Qiu,Mengting Li,Ziyu Qin,Reza A. Ghiladi,Xueqiong Yin
As bacterial infections continue to pose a significant challenge to healthcare globally, new therapeutic strategies, interventions, and complementary approaches that address both infection prevention and treatment are needed. As one such strategy, photothermal therapy (PTT) as a non-chemotherapeutic approach is considered a safe and potentially efficient strategy to combat bacterial infections, particularly for antibiotic-resistant pathogens given that PTT operates via a temperature-dependent process against which the development of bacterial resistance is unlikely. Here, we prepared Au@CDs composite nanoparticles (Au@CD) comprised of gold nanoparticles (AuNPs) and carbon dots (N,S-CDs), and investigated their use as a photothermal agent in PTT. The presence of the CDs as surface decorations conferred improved photothermal conversion efficiency, photostability, and biocompatibility to the Au@CD when compared to the parent AuNPs. To investigate if the Au@CD could serve as a PTT wound dressing and accelerate tissue repair, they were embedded within a PVA membrane via electrospinning. The resultant Au@CD membrane exhibited excellent biocompatibility and photothermal antimicrobial activity. In vitro photothermal antibacterial inactivation studies confirmed their efficacy against S. aureus and E. coli (99 + % inactivation of both pathogens under NIR irradiation). Moreover, in vivo studies employing Kunming male mice with S. aureus -infected wounds on their backs were chosen as a trauma model, with the Au@CD membranes serving as wound dressings. The results showed that a local temperature increased up to 50 °C upon NIR irradiation could effectively eradicate bacteria at the wound site, reduce the risk of bacterial infection, suppress inflammation as well as improve collagen deposition and angiogenesis, all of which together facilitated wound closure and resulted in a better therapeutic effect than the controls. Taken together, this work confirms that NIR-irradiated Au@CD-based membranes and related materials are promising photothermal antimicrobial platforms for wound dressings and related healthcare applications.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Fengxia Wang,Hui Hu,Xin Feng,Xu Ding,Wei Wang,Ji Zhang
Concerning chemical hazards, natural materials-based fabrication is highly praised for their safer and environmental-friendly fabrication. In this study, Au and Pd were modified on Fe nanoparticles , which was reduced by tea polyphenols. The as-synthesized probe (Tp-Fe/AuPd), was applied for hydrogen peroxide (H 2 O 2 ) detection. Physical characterizations showed that Au and Pd were successfully modified on the Fe nanoparticles surfaces. The electrochemical results showed that, Tp-Fe/AuPd demonstrated good anti-interference capacity, long-term stability and high sensitivity of 4.17 μA mM −1 cm −2 . Further, the probe can detect H 2 O 2 within concentration range of 0.1–10 mM, and an estimated limit of detection (LOD) of 9.53 mM, without the addition of enzymes or other extraneous materials.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yunqi Xu,Kang Wang,Senlin Zhao,Qingshan Xiong,Guanghui Liu,Yan Li,Qunling Fang,Xinglong Gong,Shouhu Xuan
Infectious diseases caused by drug-resistant bacteria bring an increasing threat to public health. Thus, finding an effective approach equipped with a synergistic antibacterial performance becomes a critical challenge. This work reports a NiFe 2 O 4 @Au/Polydopamine core/shell nanosphere with rough surface, which exhibits a photothermal and magnetolytic coupling antibacterial behavior. The Au/Polydopamine (Au/PDA) hybrid layer, covered on the stable magnetic NiFe 2 O 4 nanosphere by a one-step polymerization method, possesses an excellent photothermal effect. Simultaneously, the superparamagnetic characteristic offers the NiFe 2 O 4 @Au/Polydopamine with fantastic magnetolytic force to the biological organism under a rotating external magnetic field. It is found that the NiFe 2 O 4 @Au/PDA core/shell nanospheres show good photothermal antibacterial performance (808 nm laser irradiation) on both Escherichia coli and Staphylococcus aureus . Notably, the photothermal antibacterial performance can be significantly improved under applying the rotating magnetic field. This novel photothermal-magnetolytic coupled antimicrobial method supplies a high performance photothermal bactericidal therapy via a remote conduction and reduces the possible damage to normal tissue caused by overheating. Besides bactericidal therapy, the easily and scalable magnetolytic enhancing method is believed to possess high potential in drug delivery, antitumor, and bioseparation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ziqiong Yang,Xun Liu,Shiying Xia,Qiong Ding,Haiyan Liu,Zhengxi Wang,Long Zhang,Haibo Zhang
The discharges from urban industries and domestic sewages have caused severe environmental pollution problems. Specifically, dyes are among the pollution sources that are relatively difficult to treat. In this study, Au/CB6-BOFs (BOFs namely closo -dodecaborate-based supramolecular organic frameworks) were successfully synthesized using a simple method. The sample was used as adsorbent and degradation agents on Congo red (CR) and methyl orange (MO). The adsorption effect of Au/CB6-BOFs on CR is excellent with the adsorption capacity reaching as high as 2178.36 mg g −1 . Experiments, including adsorption kinetics , isothermal adsorption, and adsorption thermodynamics, were conducted on Au/CB6-BOFs to verify its performance, which confirmed that the adsorption type is monolayer chemical adsorption and that the reaction proceeds spontaneously. Au/CB6-BOFs can lead to catalytic degradation of dye molecules in aqueous solution with the addition of sodium borohydride. The adsorption/degradation ability of Au/CB6-BOFs can be maintained for at least five times without significant attenuating. FT-IR spectroscope and XRD were used to investigate Au/CB6-BOFs changes before and after experiments, there has been no obvious change observed in the FT-IR and XRD results. The catalytic mechanism was also proposed based on the degradation performance. In previous reports, it is might impossible to see similar nanomaterials that combine dye adsorption and dye degradation . If our material does either of them alone, it has a good effect. Considering that Au/CB6-BOFs have two functions at the same time, the initial concentrations of dyes that we set are relatively high, which is beyond the relevant literature reports. Therefore, it has certain reference value and impelling function to shorten the subsequent industrial treatment process of dye wastewater. This study provides a simple method to design and synthesis adsorption/degradation agents, which may open a new path for dye wastewater treatment .
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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 22
·225404
·
IF 3.953
Jiayin Zhu,Ran Zhang,Liye Zhu,Xuan Liu,Tiying Zhu,Ziang Guo,Yan Zhao
Gold (Au) can be used as an ideal metal electrocatalyst for ethanol and glucose oxidation reactions due to its high performance-to-cost ratio. In this paper, the Au aerogel with high-index facets was synthesized by using the laser ablation in liquid technology, which can improve the electrocatalytic activity of Au. The as-prepared Au aerogel showed excellent mass activity and specific activity toward ethanol oxidation reaction, which are 4.6 times and 2.1 times higher than Au/C, respectively. The 3D porous nature and rich defect of the Au aerogel provide more active sites. In addition, the high-index facets with under-coordinated atoms enhance the adsorption of ethanol and glucose molecules, thus improving the intrinsic catalytic activity of Au aerogel. The effect of high-index facets has also been investigated by density functional theory calculations. Furthermore, the Au aerogels also show good electrocatalytic activity and stability toward glucose oxidation reaction. These results are conducive to promote the practical application of Au in electrocatalysis.
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