tailieunhanh - Báo cáo hóa học: " In Situ Synthesis of Reduced Graphene Oxide and Gold Nanocomposites for Nanoelectronics and Biosensing"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: IIn Situ Synthesis of Reduced Graphene Oxide and Gold Nanocomposites for Nanoelectronics and Biosensing | Dong et al. Nanoscale Res Lett 2011 6 60 http content 6 1 60 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access In Situ Synthesis of Reduced Graphene Oxide and Gold Nanocomposites for Nanoelectronics and Biosensing Xiaochen Dong 1 Wei Huang1 Peng Chen2 Abstract In this study an in situ chemical synthesis approach has been developed to prepare graphene-Au nanocomposites from chemically reduced graphene oxide rGO in aqueous media. UV-Vis absorption atomic force microscopy scanning electron microscopy transmission electron microscopy and Raman spectroscopy were used to demonstrate the successful attachment of Au nanoparticles to graphene sheets. Configured as field-effect transistors FETs the as-synthesized single-layered rGO-Au nanocomposites exhibit higher hole mobility and conductance when compared to the rGO sheets promising its applications in nanoelectronics. Furthermore we demonstrate that the rGO-Au FETs are able to label-freely detect DNA hybridization with high sensitivity indicating its potentials in nanoelectronic biosensing. Introduction Graphene a single-layer of carbon atoms densely compacted into a two-dimensional honeycomb crystal lattice has attracted tremendous attention in recent years because of its unique electronic optical thermal and mechanical properties 1-9 . It provides a variety of novel applications such as field-effect transistors FETs 10 11 ultrasensitive sensors 12 13 transparent electrodes 14 and novel nanocomposites 15 16 . Graphene is particularly advantageous in biosensing due to its large detection area high charge mobility low noise and biocompatibility 17 . The common fabrication methods of graphene sheets include mechanical exfoliation from graphite 18 chemical exfoliation chemical oxidation of graphite and subsequent reduction of the exfoliated graphite oxide sheets 19 and epitaxial growth on the surface of silicon carbide crystals or metal substrates 20 21 . Among these .