TY - JOUR
T1 - Transition between ZnO nanorods and ZnO nanotubes with their antithetical properties
AU - Rana, Abu Ul Hassan Sarwar
AU - Kang, Mingi
AU - Jeong, Eun Seon
AU - Kim, Hyun Seok
N1 - Publisher Copyright:
Copyright © 2016 American Scientific Publishers All rights reserved.
PY - 2016/10
Y1 - 2016/10
N2 - In this study, we present the fabrication and transition between ZnO nanorods (ZNRs) and ZnO nanotubes (ZNTs) with their antithetical properties. We etch the aqueous chemically grown ZNRs into ZNTs via a chemical etching method in KCl solution without any surface and subsurface processing on ZNRs. In order to have a perfect transition, we change the parameters, such as KCl molar concentration, etching time, and catalyzing temperature. The SEM images show a perfect transition from ZNRs into ZNTs with almost the same diameter of around 60 nm, which is one of the smallest achieved for a transition at this time. The transition dependence of ZNRs into ZNTs on the diameter and the surface roughness of ZNRs is also substantiated by applying the etching on ZnO nanopyramids that are either not etched at the given etching time or started etching with the dissolution of lateral walls. The two different structures are characterized via a two-probe method to look at the antithetical electrical behavior of ZNRs and ZNTs. It is proved that ZNTs are more sensitive, have higher levels of current, and have lower turn-on voltages because ZNTs have a higher level of surface and subsurface oxygen vacancies with a higher surface-to-volume ratio as compared to ZNRs.
AB - In this study, we present the fabrication and transition between ZnO nanorods (ZNRs) and ZnO nanotubes (ZNTs) with their antithetical properties. We etch the aqueous chemically grown ZNRs into ZNTs via a chemical etching method in KCl solution without any surface and subsurface processing on ZNRs. In order to have a perfect transition, we change the parameters, such as KCl molar concentration, etching time, and catalyzing temperature. The SEM images show a perfect transition from ZNRs into ZNTs with almost the same diameter of around 60 nm, which is one of the smallest achieved for a transition at this time. The transition dependence of ZNRs into ZNTs on the diameter and the surface roughness of ZNRs is also substantiated by applying the etching on ZnO nanopyramids that are either not etched at the given etching time or started etching with the dissolution of lateral walls. The two different structures are characterized via a two-probe method to look at the antithetical electrical behavior of ZNRs and ZNTs. It is proved that ZNTs are more sensitive, have higher levels of current, and have lower turn-on voltages because ZNTs have a higher level of surface and subsurface oxygen vacancies with a higher surface-to-volume ratio as compared to ZNRs.
KW - Aqueous chemical growth
KW - Nanorod
KW - Nanotube
KW - Surface-to-volume ratio
KW - Zinc oxide
UR - http://www.scopus.com/inward/record.url?scp=84990879552&partnerID=8YFLogxK
U2 - 10.1166/jnn.2016.13237
DO - 10.1166/jnn.2016.13237
M3 - Article
AN - SCOPUS:84990879552
SN - 1533-4880
VL - 16
SP - 10772
EP - 10776
JO - Journal of Nanoscience and Nanotechnology
JF - Journal of Nanoscience and Nanotechnology
IS - 10
ER -