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Baik, Jeong Min
Nano Energy and Environmental Materials Lab
Research Interests
  • Nanogenerators, antimicrobial material, catalysis, smart sensors

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Parallel Aligned Mesopore Arrays in Pyramidal-Shaped Gallium Nitride and Their Photocatalytic Applications

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Title
Parallel Aligned Mesopore Arrays in Pyramidal-Shaped Gallium Nitride and Their Photocatalytic Applications
Author
Kim, Hee JunPark, JoonmoYe, Byeong UkYoo, Chul JongLee, Jong-LamRyu, Sang-WanLee, HeonChoi, Kyoung JinBaik, Jeong Min
Issue Date
2016-07
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.8, no.28, pp.18201 - 18207
Abstract
Parallel aligned mesopore arrays in pyramidal shaped GaN are fabricated by using an electrochemical anodic etching technique, followed by inductively coupled plasma etching assisted by SiO2 nanosphere lithography, and used as a promising photoelectrode for solar water oxidation. The parallel alignment of the pores of several tens of micrometers scale in length is achieved by the low applied voltage and prepattern guided anodization. The dry etching of single-layer SiO2 nanosphere-coated GaN produces a pyramidal shape of the GaN, making the pores open at both sides and shortening the escape path of evolved gas bubbles produced inside pores during the water oxidation. The absorption spectra show that the light absorption in the UV range is similar to 93% and that there is a red shift in the absorption edge by 30 nm, compared with the flat GaN. It also shows a remarkable enhancement in the photocurrent density by 5.3 times, compared with flat GaN. Further enhancement (similar to 40%) by the deposition of Ni was observed due to the generation of an electric field, which increases the charge separation, ratio
URI
https://scholarworks.unist.ac.kr/handle/201301/20707
URL
http://pubs.acs.org/doi/abs/10.1021/acsami.6b05500
DOI
10.1021/acsami.6b05500
ISSN
1944-8244
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