Xiaojuan Shen,Xuan Zhang,Tongfei Wang,Songjun Li,Zhaoqiang Li
In this study, a novel 3D porous Si-based supercapacitor electrode was developed using a simple solution method, which involved first the in situ polymerization of polyaniline particles (PANI) on Si nanowire arrays (SiNWs), followed by the further electrodeposition of a polyaniline nanofiber (PANF) film. Highly doped PEDOT:PSS layers were introduced before and after PANF deposition, serving as the built-in 3D current collector of the electrode. To improve the capacity of the electrode, the PANF film was incorporated with graphene and the PEDOT:PSS layer was doped with chloroplatinic acid (H2PtCl6). Due to the smart design, SiNWs only acted as a scaffold, thus the electrodes could be fabricated on any Si-based wafer commonly used in micro-electronic devices regardless of its purity, conductivity and surface passivation. Here, the Si-based supercapacitor electrode was first fabricated on a solar-grade (SG) Si wafer, which exhibited a high areal capacitance of 718.85 mF cm−2 at 1 mA cm−2. Additionally, an aqueous asymmetric supercapacitor was assembled by using the resultant polymer-coated SiNWs on the SG wafer as the positive electrode, and the activated carbon (AC) as the negative electrode, which exhibited an energy density of 0.194 mW h cm−2 at a power density of 0.85 mW cm−2. Both of them outperform the reported values of most of the electronic-grade (EG) Si-based electrodes and supercapacitors. This work not only paves a promising way for the design of a 3D electrode, but also opens up a new opportunity to develop low-cost and high-performance Si-based supercapacitors.
In this paper, the fluorescence quenching characteristics of Au-Ag-Pt core–shell nanorods have been studied. Due to nonradiative energy transformation, the fluorescence emission intensity of bovine serum albumin (BSA) could be greatly quenched. It has been found that the quenching effect of Au-Ag-Pt core–shell nanorods could be optimized by adjusting the concentration of chloroplatinic acid. Based on the fluorescence quenching properties of Au-Ag-Pt core–shell nanorods, Au-Ag-Pt trimetal fluorescence quenching nanoprobe has been prepared, and the specificity of alpha-fetoprotein (AFP) detection has also been realized. In order to guarantee the sensing specificity, the surface modification including carboxyl replacement, carboxyl activation and antibody connection have been performed on Au-Ag-Pt core–shell nanorods. By using the principle of specific combination of antigen and antibody, the specific detection of AFP has been realized with a lower detection limit of 4.0 pg/mL, and the linear detection range spans a scope from 0.03 to 0.5 ng/mL. Interference experiments and the actual samples detection results show that the Au-Ag-Pt trimetal core–shell nanorod probes have good anti-interference and repeatability.
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