Room-temperature optical emission properties of hydrothermal grown zinc oxide nanostructures

Authors

Erick John Carlo D Solibet ⋅ PH National Institute of Physics, University of the Philippines Diliman
Melvin John Fernandez Empizo ⋅ JP Institute of Laser Engineering, Osaka University
Maria Cecilia Moralde Angub ⋅ PH Materials Science and Engineering Program, College of Science, University of the Philippines Diliman
Christopher Jude Tan Vergara ⋅ PH Materials Science and Engineering Program, College of Science, University of the Philippines Diliman
Horace Andrew Fernandez Husay ⋅ PH National Institute of Physics, University of the Philippines Diliman, Diliman, Quezon City 1101, Philippines
Verdad Canila Agulto ⋅ JP Institute of Laser Engineering, Osaka University
Kohei Yamanoi ⋅ JP Institute of Laser Engineering, Osaka University
Toshihiko Shimizu ⋅ JP Institute of Laser Engineering, Osaka University
Elmer Surat Estacio ⋅ PH National Institute of Physics, University of the Philippines Diliman
Arnel Angud Salvador ⋅ PH National Institute of Physics, University of the Philippines Diliman
Nobuhiko Sarukura ⋅ JP Institute of Laser Engineering, Osaka University
Armando Soriano Somintac ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

We report on the room-temperature optical emissions of hydrothermal-grown zinc oxide (ZnO) nanostructures. The nanostructures were fabricated on seeded silicon (Si) substrates by hydrothermal growth method using different zinc acetate dihydrate [Zn(CH₃COO)·2H₂O, ZnAc] concentrations. Regardless of the ZnAc concentration, all nanostructures exhibit well-defined hexagonal facets and intense near-band-edge ultraviolet (UV) emissions. However, increasing the ZnAc concentration leads ZnO nanostructures which exhibit longer emission lifetimes and a secondary red-shifted UV emission around 392 nm. These changes in the nanostructures' UV emission properties are attributed to the multiple excitation/absorption and emission processes of coalescent structures and/or structures sharing common sides or boundaries. Our results suggest that for UV scintillator applications, this phenomenon in ZnO nanostructures can be reduced by using lower (< 100 mM) ZnAc concentrations during hydrothermal growth.

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Issue

2020: Proceedings of the 38th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2020-2C-02

Section

Condensed Matter Physics and Materials Science

Published

2020-10-19

How to Cite

[1]

EJCD Solibet, MJF Empizo, MCM Angub, CJT Vergara, HAF Husay, VC Agulto, K Yamanoi, T Shimizu, ES Estacio, AA Salvador, N Sarukura, and AS Somintac, Room-temperature optical emission properties of hydrothermal grown zinc oxide nanostructures, Proceedings of the Samahang Pisika ng Pilipinas 38, SPP-2020-2C-02 (2020). URL: https://proceedings.spp-online.org/article/view/SPP-2020-2C-02.