Papers by Author: Jun Wei Di

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Authors: Jian Du, Jun Wei Di
Abstract: A simple one-step method was developed to electrodeposit gold thin film from HAuCl4 solution with cyclic voltammetric mode on indium tin oxide (ITO) coated glass. The color of as-prepared gold film can vary from red to blue due to different particle-particle interaction. The Au thin film comprised of isolated gold nanoparticles (GNPs) were red color, while blue gold thin films were obtained by electrodeposition in high HAuCl4 concentration and the increasing deposition cycles.
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Authors: Qin Zhang, Yan Du, Jian Hua, Jun Wei Di
Abstract: We present a facile electrochemical deposition process to grow zinc oxide (ZnO) nanosheet structures on indium tin oxide (ITO) substrate. The deposited ZnO was applied to immobilization of glucose oxidase and construction of glucose electrochemical biosensor due to a large surface area and good biocompatibility. The direct electron transfer of GOD immobilized on ZnO nanosheets was achieved and could be used to determination of glucose. Such ZnO nanosheet structures provide a good matrix for protein immobilization and biosensor fabrication.
2450
Authors: Nan Yu Ma, Dan Zeng, Yu Jie Huang, Jun Wei Di, Mu Sen Li
Abstract: Ag nanoparticles (NPs) have prominent local surface plasma resonance effect (LSPR), and Ag NPs exhibit sharpest and strongest bands among all metals. Diamond-like carbon (DLC) film have good biological compatibility and also have high transmissibility in the visible and near-infrared region. A new LSPR interface between Ag NPs and ultra-thin DLC film was formed by Plasma Enhanced Chemical Vapor Deposition. The morphologies and properties of the Ag NPs coated with DLC film were studied with SEM and AFM. The results indicated that the thickness of DLC film increased with the deposition time. LSPR peak became sharper after depositing for 1 or 2 min. DLC film was prior to nucleate on the surface of Ag NPs, and it has high content of sp2 bonds near the interface. The sensitivity of new LSPR interface deposited for 20s was about the half of the sensitivity of bare Ag NPs and the sensitivity significantly decreased with deposition time. This result is helpful to understand the behavior of the new LSPR interface and to improve its sensitivity.
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Authors: Hua Song, Nan Yu Ma, Jun Wei Di, Mu Sen Li
Abstract: Ag nanoparticles (NPs) had most prominent local surface plasma resonance effect (LSPR) among the all metals. Diamond-like carbon (DLC) film had good biological compatibility, wear resistance, corrosion-resisting and high transmission ability in the visible and near-infrared range. Since the Ag NPs were easily oxidized in air,a new LSPR interface between them and an ultra-thin DLC films was formed by means of a plasma enhanced chemical vapor deposition (PECVD). The morphologies and properties of the Ag NPs deposited ultra-thin DLC films were studied by using Raman spectrometer, X-ray photoelectron spectrometer (XPS) , field emission scanning electron microscope (FESEM) and atomic force microscope (AFM) and so on. And the optical tramsmission sensitivity of the new LSPR interface was also examined. The results indicated that the DLC films deposited in a shorter time had a higher sp3 bond content of carbon atoms and more sensitive to refractive index of surrounding media. Moreover, to obtain the optimal morphologies and the sensing property, the deposition time for forming the DLC films should be controlled within 30 seconds.
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