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Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing

R. Majithia, S. Ritter, K.E. Meissner, Kenith Meissner

Analytica Chimica Acta, Volume: 812, Pages: 206 - 214

Swansea University Author: Kenith Meissner

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DOI (Published version): 10.1016/j.aca.2014.01.012

Abstract

We present a novel method for colloidal synthesis of one-dimensional ZnO nanopods by heterogeneous nucleation on zero-dimensional ZnO nanoparticle ‘seeds’. Ultra-small ZnO nanopods, multi-legged structures with sub-20 nm individual leg diameters, can be synthesized by hydrolysis of a Zn2+ precursor...

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Published in: Analytica Chimica Acta
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa21481
first_indexed 2015-05-19T02:03:12Z
last_indexed 2019-08-09T15:03:19Z
id cronfa21481
recordtype SURis
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spelling 2019-08-08T10:55:26.5998409 v2 21481 2015-05-18 Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing 30fdfec0d8b19b59b57a818e054d4af3 Kenith Meissner Kenith Meissner true false 2015-05-18 We present a novel method for colloidal synthesis of one-dimensional ZnO nanopods by heterogeneous nucleation on zero-dimensional ZnO nanoparticle ‘seeds’. Ultra-small ZnO nanopods, multi-legged structures with sub-20 nm individual leg diameters, can be synthesized by hydrolysis of a Zn2+ precursor growth solution in presence of ∼4 nm ZnO seeds under hydrothermal conditions via microwave-assisted heating in as little as 20 min of reaction time. One-dimensional ZnO nanorods are initially generated in the reaction mixture by heterogeneous nucleation and growth along the [0001] direction of the ZnO crystal. Growth of one-dimensional nanorods subsequently yields to an ‘attachment’ and size-focusing phase where individual nanorods fuse together to form multi-legged nanopods having diameters ∼15 nm. ZnO nanopods exhibit broad orange-red defect-related photoluminescence in addition to a near-band edge emission at 373 nm when excited above the band-gap at 350 nm. The defect-related photoluminescence of the ZnO nanopods has been applied towards reversible optical humidity sensing at room temperature. The sensors demonstrated a linear response between 22% and 70% relative humidity with a 0.4% increase in optical intensity per % change in relative humidity. Due to their ultra-small dimensions, ZnO nanopods exhibit a large dynamic range and enhanced sensitivity to changes in ambient humidity, thus showcasing their ability as a platform for optical environmental sensing. Journal Article Analytica Chimica Acta 812 206 214 17 2 2014 2014-02-17 10.1016/j.aca.2014.01.012 Published in a leading analytical science journal (Impact factor: 4.712), this work elucidates the dynamics and mechanisms of ZnO nanopods and applies the resulting structures to humidity sensing. Through understanding of this mechanism, the work enables rational design of nanostructures to optimise their sensing capabilities. The work follows from the Meissner group’s extensive expertise in the microwave production of nanostructures from ZnO (5 journal publications) and CdSe (5 journal publications) since 2010. Preliminary data from this work formed the core of an invited talk at an international conference (SPIE, Photonics West, 2011). COLLEGE NANME COLLEGE CODE Swansea University 2019-08-08T10:55:26.5998409 2015-05-18T11:38:21.6074325 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised R. Majithia 1 S. Ritter 2 K.E. Meissner 3 Kenith Meissner 4
title Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing
spellingShingle Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing
Kenith Meissner
title_short Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing
title_full Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing
title_fullStr Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing
title_full_unstemmed Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing
title_sort Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing
author_id_str_mv 30fdfec0d8b19b59b57a818e054d4af3
author_id_fullname_str_mv 30fdfec0d8b19b59b57a818e054d4af3_***_Kenith Meissner
author Kenith Meissner
author2 R. Majithia
S. Ritter
K.E. Meissner
Kenith Meissner
format Journal article
container_title Analytica Chimica Acta
container_volume 812
container_start_page 206
publishDate 2014
institution Swansea University
doi_str_mv 10.1016/j.aca.2014.01.012
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
active_str 0
description We present a novel method for colloidal synthesis of one-dimensional ZnO nanopods by heterogeneous nucleation on zero-dimensional ZnO nanoparticle ‘seeds’. Ultra-small ZnO nanopods, multi-legged structures with sub-20 nm individual leg diameters, can be synthesized by hydrolysis of a Zn2+ precursor growth solution in presence of ∼4 nm ZnO seeds under hydrothermal conditions via microwave-assisted heating in as little as 20 min of reaction time. One-dimensional ZnO nanorods are initially generated in the reaction mixture by heterogeneous nucleation and growth along the [0001] direction of the ZnO crystal. Growth of one-dimensional nanorods subsequently yields to an ‘attachment’ and size-focusing phase where individual nanorods fuse together to form multi-legged nanopods having diameters ∼15 nm. ZnO nanopods exhibit broad orange-red defect-related photoluminescence in addition to a near-band edge emission at 373 nm when excited above the band-gap at 350 nm. The defect-related photoluminescence of the ZnO nanopods has been applied towards reversible optical humidity sensing at room temperature. The sensors demonstrated a linear response between 22% and 70% relative humidity with a 0.4% increase in optical intensity per % change in relative humidity. Due to their ultra-small dimensions, ZnO nanopods exhibit a large dynamic range and enhanced sensitivity to changes in ambient humidity, thus showcasing their ability as a platform for optical environmental sensing.
published_date 2014-02-17T06:42:08Z
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score 10.969525

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