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

R. Majithia, Sarah C. Ritter, K. E. Meissner

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 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.

Original languageEnglish (US)
Pages (from-to)206-214
Number of pages9
JournalAnalytica Chimica Acta
Volume812
DOIs
StatePublished - Feb 17 2014

Fingerprint

Humidity
Nanotubes
nucleation
Atmospheric humidity
humidity
Nucleation
Nanorods
defect
relative humidity
seed
Seed
Seeds
Photoluminescence
Growth
Defects
hydrolysis
Electric fuses
Microwaves
Nanoparticles
Heating

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Environmental Chemistry
  • Biochemistry
  • Spectroscopy

Cite this

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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 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.",
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Heterogeneous nucleation for synthesis of sub-20nm ZnO nanopods and their application to optical humidity sensing. / Majithia, R.; Ritter, Sarah C.; Meissner, K. E.

In: Analytica Chimica Acta, Vol. 812, 17.02.2014, p. 206-214.

Research output: Contribution to journalArticle

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