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Micromachines 2017, 8(2), 47; doi:10.3390/mi8020047

Fabrication of Graphene Aerogels with Heavily Loaded Metallic Nanoparticles

1
NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
2
Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32826, USA
3
Department of Chemistry, University of Central Florida, Orlando, FL 32826, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Hongrui Jiang
Received: 29 November 2016 / Revised: 24 January 2017 / Accepted: 3 February 2017 / Published: 7 February 2017
(This article belongs to the Special Issue Bio-Inspired Micro/Nano Devices and Systems)
View Full-Text   |   Download PDF [4504 KB, uploaded 7 February 2017]   |  

Abstract

Natural biomaterials with hierarchical structures that enable extraordinary capability of detecting chemicals have inspired the interest in producing materials that can mimic these natural structures. This study reports the fabrication of hierarchically-structured, reduced graphene oxide (rGO) aerogels with heavily loaded palladium (Pd), platinum (Pt), nickel (Ni), and tin (Sn) metallic nanoparticles. Metal salts chelated with ethylenediaminetetraacetic acid (EDTA) were mixed with graphene oxide (GO) and then freeze-dried. The subsequent reduction produces rGO/metal nanoparticle aerogels. SEM and EDS results indicated that a loading of 59, 67, 39, and 46 wt % of Pd, Pt, Ni, and Sn nanoparticles was achieved. Pd/rGO aerogels of different Pd nanoparticle concentrations were exposed to H2 gas to monitor the resistance change of the composites. The results suggest that rGO aerogels can achieve a higher nanoparticle loading by using chelation to minimize electrostatic interactions between metal ions and GO. Higher loading of Pd nanoparticles in graphene aerogels lead to improved hydrogen gas sensing performance. View Full-Text
Keywords: graphene; aerogels; metal nanoparticles; hydrogen sensors graphene; aerogels; metal nanoparticles; hydrogen sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Shen, C.; Barrios, E.; McInnis, M.; Zuyus, J.; Zhai, L. Fabrication of Graphene Aerogels with Heavily Loaded Metallic Nanoparticles. Micromachines 2017, 8, 47.

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