Poly[3-(2-hydroxyethyl)-2,5-thienylene] grafted reduced graphene oxide: an efficient alternate material of TiO2 in dye sensitized solar cells

Shreyam Chatterjee, Astam K. Patra, Asim Bhaumik, Arun K. Nandi
2013 Chemical Communications  
Experimental: Preparation of acyl chloride functionalized reduced graphene oxide (frGO): At first graphite oxide is prepared from graphite powder by oxidizing with KMnO 4 / NaNO 3 mixture in concentrated H 2 SO 4 medium using Hummers method. 1 In this typical procedure, 75mg graphite oxide is dispersed in 75ml water (0.1% w/v). After sonication for 1 h in an ultrasonic bath (60W, frequency 28 KHz, Model AVIOC, Eyela), exfoliation of graphite oxide occurs and a clear brownish dispersion of
more » ... ne oxide (GO) is formed. Then the GO sample (40 mg) containing plenty active >COOH groups on its basal planes and edges is refluxed with excess SOCl 2 (20 ml) for 24 h under, and then the residual SOCl 2 was removed by distillation under reduced pressure, and further dried under vacuum to yield the acyl chloride-functionalized reduced GO (frGO). It is reported that during functionalization by SOCl 2 GO gets reduced to rGO. Covalent grafting of monomer 3-(2-hydroxyethyl)-2,5-thienylene (HET) with reduced graphene oxide (frGO): The frGO is dispersed in 15 ml anhydrous THF, and the mixture is sonicated for 30 min in order to create a homogeneous dispersion. The dispersed sample is refluxed with 5mmol (0.64g = 445µl) of 3-(2-hydroxyethyl)-2, 5-thienylene in the presence of a catalytic amount of triethylamine for 24 h under nitrogen atmosphere. The resulting reaction medium is diluted in excess THF. The resultant HET-g-rGO is collected by centrifuging the solution and is subsequently dried overnight under reduced pressure. Oxidative polymerization of HET-g-rGO (PHET-g-rGO): Electronic Supplementary Material (ESI) for Chemical Communications This journal is
doi:10.1039/c3cc40843d pmid:23579544 fatcat:ugdoll7zxnhlphtq3t3coslame