Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 4, Pages 1948-1953Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am201654b
Keywords
graphene oxide; polystyrene; p-phenylene diamine; chemical reduction; electrical conductivity; thermal stability
Funding
- National Natural Science Foundation of China [51073012, 51125010]
- Ministry of Education of China [NCET-08-0711]
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A facile and efficient approach was developed to simultaneously functionalize and reduce graphene oxide (GO) with p-phenylene diamine (PPD) by simple refluxing. This was possible by the nucleophilic substitution reaction of epoxide groups of GO with amine groups of PPD aided by NH3 solution. As a consequence, electrical conductivity of GO-PPD increased to 2.1 x 10(2) S/m, which was nearly 9 orders of magnitude higher than that of GO. Additionally, after the incorporation of GO-PPD in polystyrene (PS), the composites exhibited a sharp transition from electrically insulating to conducting behavior with a low percolation threshold of similar to 0.34 vol %, which was attributed to the improved dispersion and the reduction of GO-PPD. Thermal stability of the PS/GO-PPD composite was also similar to 8 degrees C higher than that of PS.
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