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Strong Red Luminescent Twin ZnO Nanorods for Nano-thermometryApplication

Published online by Cambridge University Press:  24 February 2016

Avanendra Singh ,
Kartik Senapati ,
Karuna Kar Nanda  and
Pratap K. Sahoo
Avanendra Singh
Affiliation:
School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Odisha-751005, India
Kartik Senapati
Affiliation:
School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Odisha-751005, India
Karuna Kar Nanda
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560012, India
Pratap K. Sahoo*
Affiliation:
School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, Odisha-751005, India
*
*pratap.sahoo@niser.ac.in
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Abstract

Two segments of horizontally grown crystalline ZnO nanorods (NRs) connected withan amorphous layer have been successfully and reproducibly synthesized usingone-step hydrothermal technique by controlling the growth rate. The confocalphotoluminescence (PL) imaging and spectroscopy of twin ZnO NRs at differenttemperatures shows intense red emission with comparably week UV emission. Thestrong red emission from the twin NRs is a consequence of structuralimperfections. Both UV and red bands showed signatures of strong temperaturedependent exciton-phonon scattering. Using the intensity ratio of the UV and redemissions, we show that the individual ZnO NRs can be used as highly sensitivecryogenic temperature sensors below ∼175 K.

Keywords

luminescencescanning electron microscopy (SEM)hydrothermal

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Type
Articles
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MRS Advances , Volume 1 , Issue 13: Nanomaterials and Synthesis , 2016 , pp. 869 - 874
Copyright
Copyright © Materials Research Society 2016 

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References

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