Synthesis and electron transfer property of sulfhydryl-containing multi-walled carbon nanotube/gold nanoparticle heterojunctions

Abstract

One-dimensional metal/semiconductor heterojunction nanomaterials have opened many new opportunities for future nanodevices because of their novel structures and unique electrical and optical properties. In this work, sulfhydryl-containing multi-walled carbon nanotube/gold nanoparticle (MWCNT/Au) heterojunctions were synthesized in high yield by a sulfhydryl- functionalized self-assembly strategy. The component, size, structure, morphology and bond mode of the MWCNT/Au heterojunctions thus prepared were investigated and demonstrated by transmission electron microscopy, scanning electron microscopy, x-ray diffraction, energy-dispersive x-ray spectroscopy, Fourier-transform infrared and UV–visible measurements. Cyclic voltammogram and electrochemical impedance spectroscopy studies indicate that the MWCNT/Au heterojunctions have a novel electron transfer property, which retards electron transfer of the horseradish peroxidase or the ferricyanide in the underlying electrodes. We believe that MWCNT/Au heterojunctions with high stability and a unique electrical property are expected to find potential applications for nanodevices.

Electrochemical immunosensor for prostate-specific antigen using a glassy carbon electrode modified with a nanocomposite containing gold nanoparticles supported with starch-functionalized multi-walled carbon nanotubes

“…As expected, Au 4f doublet features can be clearly observed at the Au/CAS-MWCNTs composites, confirming the presence of Au metal, and indicating that gold nanoparticles are indeed successfully attached onto the Au/CASMWCNTs composites modified electrode. The (002) diffraction peak of XRD corresponds to graphite from MWCNTs [25,36], which is consistent with the previous study [26]. The XRD results suggest that MWCNTs and gold nanoparticles still retain their crystalline structures in the AuNPs/CAS-MWCNT nanocomposites.…”

“…Due to above advantages it also have gained considerable attention in the PSA detection, and a few electrochemical immunoassays have been reported such as amperometric immunosensor [19], electrochemical assay by ferrocenefunctionalized peptide probes [20], organic electrochemical transistor based immunosensor [21], cadmium ionfunctionalized PSA@PAA nanospheres electrochemical immunoassay [22], immunosensor modified by conductive multilayer film comprised of multi-wall carbon nanotubes [23], etc. Among these electrochemical biosensors, carbon nanomaterials have attracted considerable attention because of their extraordinary properties including high strength and flexibility, high thermal and electrical conductivity, and low density [24][25][26]. Since pristine carbon nanotubes (CNTs) are chemically inert, it is necessary to activate the graphitic surface of the nanotubes in order to combination of functional material with carbon nanotubes.…”

One‐Pot Route to Gold Nanoparticles Embedded in Electrospun Carbon Fibers as an Efficient Catalyst Material for Hybrid Alkaline Glucose Biofuel Cells

“…Regarding Figure b, both carbonized fiber samples present a broad peak in the region of 2 θ ≈25° that corresponds to the (002) planes; this is indicative of the presence of graphitic domains . The other peaks located at around 2 θ =38.5, 44.8, and 64.9° correspond to the (111), (200), and (220) planes, respectively, of the pure face‐centered crystalline structure of gold (according to PDF card number 00‐004‐0784 and the literature) . With the aid of the Scherrer equation [ L c =0.9 λ ( β cos θ ) −1 , in which λ is the X‐ray wavelength, β is the full width at half maximum of the peak, and θ is the Bragg angle], one can calculate the crystallite size ( L c ) of the sample.…”

Facile Synthesis of β-Lactoglobulin-Functionalized Reduced Graphene Oxide and Trimetallic PtAuPd Nanocomposite for Electrochemical Sensing

“…Because of its amphiphilic properties, hydrophilic groups adsorbed on the hydrophobic side on graphene surface exposure can facilitate material dispersion. Besides, the structural surface of BLG is rich in sulfhydryl groups that could promote the adsorption of metal nanoparticles [ 28 , 29 , 30 ]. The uniform distribution of nanoparticles on the surface of graphene also effectively prevents the accumulation of composites.…”