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Hollow Silver Nanostructures: The Role of Capping Agents in Tailoring the Shape, Structure, and Plasmonic Properties

Published online by Cambridge University Press:  29 April 2019

Bhavesh Kumar Dadhich ,
Bhavya Bhushan  and
Amiya Priyam
Bhavesh Kumar Dadhich
Affiliation:
Department of Physics, School of Applied Sciences, Kalinga Institute of Industrial Technology, Bhubaneswar-751024, India
Bhavya Bhushan
Affiliation:
Department of Physics, School of Applied Sciences, Kalinga Institute of Industrial Technology, Bhubaneswar-751024, India
Amiya Priyam*
Affiliation:
Department of Chemistry, School of Physical and Chemical Sciences, Central University of South Bihar, SH-7, Gaya-Panchanpur Road, Gaya-824236, India
*
*Author for correspondence: Amiya Priyam, E-mail: [email protected]
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Abstract

The shape- and structure-directing ability of capping agents, namely, acetic acid (AA) and folic acid (FA), has been analyzed in the synthesis of hollow plasmonic nanostructures via the nanoscale Kirkendall effect. FA was found to possess both shape-directing and structure-directing abilities when spherical solid Ag2O nanoparticles were transformed into hollow silver nanocubes (HAgNCs). In contrast, AA acted only as a structure-directing agent in the transformation from solid Ag2O nanospheres to hollow Ag nanospheres (HAgNSs). FA capping leads to enhanced plasmon tunability range from 535 to 640 nm in the hollow silver nanostructures. The size and shape of nanostructures were analyzed by high-resolution transmission electron microscopy (HRTEM). HRTEM revealed that the outer diameter of AA-capped HAgNSs is 50 ± 10 nm while edge-length for FA-capped HAgNCs is 100 ± 15 nm. The diameter of inner void space was found to be 30 ± 5 and 43 ± 5 nm for HAgNSs and HAgNCs, respectively. The phase purity of the hollow nanostructures was confirmed by X-ray diffraction and energy dispersive X-ray measurements. Due to unique structural and plasmonic features, FA-capped HAgNCs are well-suited for biomedical applications.

Keywords

HRTEMnanocubesnanoparticlesnanoshellssurface plasmon resonance
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 25 , Issue 6 , December 2019 , pp. 1431 - 1436
Copyright
Copyright © Microscopy Society of America 2019 

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