Synthesis of Hydrogenated Graphite Nanostructures and Their Size-dependent Photoluminescence†

doi:10.7503/cjcu20131090

Abstract

Abstract:

Hydrogenated graphite/graphene nanostructures(HGNSs) were synthesized via a solvothermal route at 180 ℃ using potassium as the reductant and halogenobenzene(bromobenzene and dibromobenzene) as the carbon precursor. Selective cleavage of the relatively lower stable C—Br bonds(compared to C—H bonds) of the carbon precursor(C₆H₅Br and C₆H₄Br₂, respectively) by K metal results in the growth of hydrogenated carbon nanostructures. The HGNSs grow through the polymerization and bonding of the remained hexagonal carbon rings after the debromination. The samples synthesized using C₆H₅Br and C₆H₄Br₂ as carbon precursor are visually tawny and black, respectively. Raman and infrared spectra of the samples show that the black product is hydrogenated graphite nanosheets with the size of about 2 nm, while the tawny sample has smaller size. X-Ray diffraction(XRD) measurements show that the products are stacked in a rhombohedral structure, but with low crystallinity. Photoluminescence(PL) measurements of the samples reveal that the fluorescence intensity and energy are related to the size of the formed HGNSs. The fluorescence intensity of the tawny pro-duct is about 15 times higher than that of the black one under the same experimental conditions. A photoluminescence mechanism similar to that of graphite oxide has been proposed for the HGNSs.

Key words: Halogenobenzene, Solvothermal route, Hydrogenated graphite nanostructure, Photoluminescence

CLC Number:

O613.7

TrendMD:

ZHAO Shijia, ZHANG Weiwei, WANG Shuguang, XIAO Junping, GONG Chen, DU Mingrun, YAO Mingguang, LIU Bingbing. Synthesis of Hydrogenated Graphite Nanostructures and Their Size-dependent Photoluminescence^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 711.

Figures/Tables 6

Fig.1 TEM images(A, C) and electron diffraction patterns(B, D) of HGNSs samples synthesized from brombenzol(A, B) and dibromobenzene(C, D)

Fig.2 Raman spectra of HGNSs synthesized from brombenzol(a) and dibromobenzene(b) excited at 514.5 nm(A) and the corresponding vibrations of HGNSs synthesized from dibromobenzene(B)

Fig.3 IR spectra of HGNSs synthesized from brombenzol(a) and dibromobenzene(b) (B), (C) are the enlarged spectra of (A) in the ranges of 1350—1600 cm-1 and 2750—3150 cm-1, respectively.

Fig.4 XRD patterns of the HGNSs synthesized from brombenzol(a) and dibromobenzene(b)The diffraction peaks of rhombohedral carbon are given by tick marks at the bottom.

Fig.5 Sketch maps for the solvothermal reactions using two carbon precursors

Fig.6 Room temperature photoluminescence spectra of the as-prepared HGNSs from brombenzol(a) and dibromobenzene(b)λex=514.5 nm.

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