Hierarchical ZnO Nanowires-loaded Sb-doped SnO 2 -ZnO Micrograting Pattern via Direct Imprinting-assisted Hydrothermal Growth and Its Selective Detection of Acetone Molecules

Hak Jong Choi, Seon Jin Choi, Soyoung Choo, Il Doo Kim, Heon Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We propose a novel synthetic route by combining imprinting transfer of a Sb-doped SnO 2 (ATO)-ZnO composite micrograting pattern (MP), i.e., microstrip lines, on a sensor substrate and subsequent hydrothermal growth of ZnO nanowires (NWs) for producing a hierarchical ZnO NW-loaded ATO-ZnO MP as an improved chemo-resistive sensing layer. Here, ATO-ZnO MP structure with 3-Î 1/4m line width, 9-Î 1/4m pitch, and 6-Î 1/4m height was fabricated by direct transfer of mixed ATO and ZnO nanoparticle (NP)-dispersed resists, which are pre-patterned on a polydimethylsiloxane (PDMS) mold. ZnO NWs with an average diameter of less than 50 nm and a height of 250 nm were quasi-vertically grown on the ATO-ZnO MP, leading to markedly enhanced surface area and heterojunction composites between each ATO NP, ZnO NP, and ZnO NW. A ZnO NW-loaded MP sensor with a relative ratio of 1:9 between ATO and ZnO (1:9 ATO-ZnO), exhibited highly sensitive and selective acetone sensing performance with 2.84-fold higher response (Rair/Rgas = 12.8) compared to that (Rair/Rgas = 4.5) of pristine 1:9 ATO-ZnO MP sensor at 5 ppm. Our results demonstrate the processing advantages of direct imprinting-assisted hydrothermal growth for large-scale homogeneous coating of hierarchical oxide layers, particularly for applications in highly sensitive and selective chemical sensors.

Original languageEnglish
Article number18731
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 2016 Jan 8

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Acetone
Nanowires
Molecules
Nanoparticles
Sensors
Microstrip lines
Composite materials
Chemical sensors
Linewidth
Oxides
Heterojunctions
Coatings
Substrates
Processing

ASJC Scopus subject areas

  • General

Cite this

Hierarchical ZnO Nanowires-loaded Sb-doped SnO 2 -ZnO Micrograting Pattern via Direct Imprinting-assisted Hydrothermal Growth and Its Selective Detection of Acetone Molecules. / Choi, Hak Jong; Choi, Seon Jin; Choo, Soyoung; Kim, Il Doo; Lee, Heon.

In: Scientific Reports, Vol. 6, 18731, 08.01.2016.

Research output: Contribution to journalArticle

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