Issue 25, 2016

Tuning the band-gap of h-boron nitride nanoplatelets by covalent grafting of imidazolium ionic liquids

Abstract

Imidazolium ionic liquids with three different anions, viz. bis(salicylato)borate (BScB), oleate (OL) and hexafluorophosphate (PF6), are covalently grafted on h-boron nitride nanoplatelets (h-BNNPs) to probe the shifts in the band gap energy. The grafting of ionic liquids on h-BNNPs was confirmed by FTIR, XPS, TGA and EDX analyses, whereas XRD and HRTEM results suggested that the crystalline and layering structure of h-BNNPs remained intact after covalent grafting of ionic liquids. The characteristic band gap energy of h-BNNPs (5.9 eV) was reduced to 5.78, 5.25 and 5.00 eV in h-BNNPs-OL, h-BNNPs-PF6 and h-BNNPs-BScB, respectively. The band gap of h-BNNPs-ILs is controlled by charge transfer between the ionic liquids and h-BNNPs, and exhibited strong correlation with the chemical structure of the associated anion in h-BNNPs-ILs.

Graphical abstract: Tuning the band-gap of h-boron nitride nanoplatelets by covalent grafting of imidazolium ionic liquids

Supplementary files

Article information

Article type
Paper
Submitted
30 Dec 2015
Accepted
16 Feb 2016
First published
16 Feb 2016

RSC Adv., 2016,6, 21119-21126

Tuning the band-gap of h-boron nitride nanoplatelets by covalent grafting of imidazolium ionic liquids

S. Kumari, R. Gusain and O. P. Khatri, RSC Adv., 2016, 6, 21119 DOI: 10.1039/C5RA28037K

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