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Strong Red Luminescent Twin ZnO Nanorods for Nano-thermometry Application

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
*
*[email protected]
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Abstract

Two segments of horizontally grown crystalline ZnO nanorods (NRs) connected with an amorphous layer have been successfully and reproducibly synthesized using one-step hydrothermal technique by controlling the growth rate. The confocal photoluminescence (PL) imaging and spectroscopy of twin ZnO NRs at different temperatures shows intense red emission with comparably week UV emission. The strong red emission from the twin NRs is a consequence of structural imperfections. Both UV and red bands showed signatures of strong temperature dependent exciton-phonon scattering. Using the intensity ratio of the UV and red emissions, we show that the individual ZnO NRs can be used as highly sensitive cryogenic temperature sensors below ∼175 K.

Keywords

luminescencescanning electron microscopy (SEM)hydrothermal
Type
Articles
Information
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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