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Electron microscopic characterization of multi-layer boron nitride nanosheets

Published online by Cambridge University Press:  11 July 2013

Muhammad Sajjad  and
Peter Feng
Muhammad Sajjad
Affiliation:
Department of Physics, College of Natural Sciences, University of Puerto Rico, P.O. Box 70377, San Juan, PR/USA 00936-8377
Peter Feng*
Affiliation:
Department of Physics, College of Natural Sciences, University of Puerto Rico, P.O. Box 70377, San Juan, PR/USA 00936-8377
*
*Corresponding author: e-mail: p.feng@upr.edu
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Abstract

We report on the direct synthesis of multi-layer boron nitride nanosheets (BNNSs) and their electron microscopic characterization. The synthesis process is carried out by irradiating hexagonal boron nitride (h-BN) target using short laser pulses. Scanning electron microscopy showed large area (≈50×50 μm2) flat layers of BNNSs transparent to the electron beam. Low magnification transmission electron microscope (TEM) is used to characterize different areas of nanosheets. TEM revealed that each individual nanosheet is composed of several layers. High resolution TEM (HRTEM) measurements confirmed the layered structure. HRTEM analysis of the edge of a nanosheet showed 10 layers from which we obtained the thickness (3.3nm) of an individual nanosheet. Selected area electron diffraction pattern indicated polycrystalline structure of nanosheets. Raman spectroscopy clearly identified E2g vibrational mode related to h-BN.

Keywords

laser ablationlayerednanoscale
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1549: Symposium O – Carbon Functional Nanomaterials, Graphene and Related 2D-Layered Systems , 2013 , pp. 85 - 90
Copyright
Copyright © Materials Research Society 2013 

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