Graphene Based Multifunction Nanomaterials: Design, Fabrication And Its Application For Sensoring

Reacently, the construction of multifunction nanomaterials play an important role in varity fileds such as materials science, biotechnology and nanotechnology. Among lots of nanomaterials graphene have attracted greatly attention. To our best knowledge, the profermance of material is not only depends on its nature property but also the structure. In this paper, we discuss how to employ graphene as the core to conbine with other nanoscale blocks for the design and construction of graphene based multifunction nanomaterials. Moreover, we explored the features and mechanism of self-assembled multifunction nanomaterials and fabricated chemical sensors. The main research contents and conclusions of this paper are shown below:1. The design and fabrication of graphene based ternary nanohybrids by using self-assemblying method. A novel functional peptide molecule, which has the ability to form peptide nanofibers ?PNFs? and specific material recognition with graphene quantum dots ?GQDs? and graphene oxide ?GO? nanosheet was employed. Based on the design of peptide sequence, ternary nanohybrids of GQD-PNF-GO were synthesized successfully. Moreover, it was found that the synthesized ternary GQD-PNF-GO nanohybrids show potential applications for electrochemical biosensor. This fabricated biosensor exhibits high sensitivity and selectivity, low detection limit, and wide linear range for sensing hydrogen peroxide. We believe that the strategies shown in this work will benefit the further synthesis of functional nanomaterials for various applications.2. We demonstrated here a facile approach to produce a large-scale reduced graphene oxide-silver nanoparticle ?RGO-AgNP? hybrid film. The RGO-AgNP nanohybrids were firstly synthesized by reducing graphene oxide ?GO? and Ag+ cations with sodium citrate, and the RGO-AgNP hybrid film was then fabricated by evaporating the RGO-AgNP nanohybrids solution and harvesting the film formed at the air-liquid interface with a solid substrate. Due toAgNP have its ability for surface-enhanced Raman scattering ?SERS?, thus RGO-AgNP hybrid film was further explored its application as a highly active SERS substrate. Two probe molecules, Rhodamine 6G ?R6G? and melamine ?MA?, were chosen to evaluate the enhancement performance of the fabricated SERS-active substrate. Our results indicated that this RGO-AgNP hybrid film-based SERS-active substrate presents outstanding performances for detecting R6G with an enhancement factor of 2.3 × 10⁶ and a detection limit of approximately 1.0 × 10^-12 M. In addition, this SERS substrate shows excellent ability to recognize MA molecules with a detection limit of approximately 1.0 × 10^-7M.3. By using the eletrospining technique the 3D polymeric NG/AgNP 3D nanofibrous membrane-modified electrode ?MME? was fabricated. Firstly, the large scale graphene sheet was cut into nanoscale ?< 500 nm? which can be highly dispersed with AgNP and electropun into nanofiber onto the surface of glassy carbon electrode to form MME. With this technique, the structure, mechanical stability, biochemical functionality, and other properties of the fabricated membrane electrode material can be easily controlled. Moreover, the whole process is efficient, simple, and the morphology of nanofibers can be controlled by adjusting the concentration of precursor solution, the condition of electrospining technique.