Nano-structuring metal organic frameworks on semiconductor nanowire arrays for highly sensitive and selective chemical sensing

Author:

John Alishba T.1ORCID,Wei Shiyu2ORCID,Yuwono Jodie A.345ORCID,Kumar Priyank3ORCID,Nisbet David R.678ORCID,Karawdeniya Buddini I.2ORCID,Fu Lan2ORCID,Murugappan Krishnan19ORCID,Tricoli Antonio110ORCID

Affiliation:

1. Nanotechnology Research Laboratory, Research School of Chemistry, College of Science, The Australian National University 1 , Australian Capital Territory 2601, Australia

2. Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems, Department of Electronic Materials Engineering, Research School of Physics, The Australian National University 2 , Australian Capital Territory 2601, Australia

3. School of Chemical Engineering, University of New South Wales 3 , New South Wales 2052, Australia

4. College of Engineering and Computer Science, Australian National University 4 , Australian Capital Territory 2601, Australia

5. School of Chemical Engineering and Advanced Materials, The University of Adelaide 5 , South Australia 5005, Australia

6. Laboratory of Advanced Biomaterials, Research School of Chemistry and the John Curtin School of Medical Research, The Australian National University 6 , Australian Capital Territory 2601, Australia

7. The Graeme Clark Institute, The University of Melbourne 7 , Victoria 3010, Australia

8. Department of Biomedical Engineering, Faculty of Engineering and Information Technology, The University of Melbourne 8 , Victoria 3010, Australia

9. Commonwealth Scientific and Industrial Research Organization (CSIRO), Mineral Resources 9 , Private Bag 10, Clayton South, Victoria 3169, Australia

10. Nanotechnology Research Laboratory, School of Biomedical Engineering, Faculty of Engineering, The University of Sydney 10 , New South Wales 2006, Australia

Abstract

Chemiresistive sensing of gas molecules has been widely investigated for application in medical diagnostics and environmental monitoring, showing high sensitivity and low limits of detection toward various volatile organic compounds. While metal oxide semiconductors offer numerous advantages, such as ease of fabrication, high sensitivity, and fast response times, they often suffer of high insufficient selectivity. Here, we report the engineering of a low-temperature sensing platform consisting of nanostructured zeolitic imidazolate framework (ZIF-8) metal organic frameworks (MOFs) over InP semiconducting nanowire (NW) arrays. These devices were fabricated via top-down etching of InP NW arrays, aerosol deposition of flame-made ZnO nanoparticles, and their chemical vapor conversion to ZIF-8. The presence of ZIF-8 significantly enhances the device sensitivity over that of the pristine InP NW arrays by providing a high density of adsorption sites and faster reduction kinetics. Our optimal sensors can detect NO2 in a large concentration range from 0.1 to 8 ppm, in addition to showing relatively higher responses toward various gas molecules, including CO2, methanol, ethanol, acetone, and propane, in comparison with pristine InP NW sensors. Given the large family of MOFs with controllable pore size and chemical composition, our findings provide a flexible approach for engineering the selectivity of highly sensitive and miniaturized gas sensors for integration in miniaturized devices.

Funder

National Health and Medical Research Council

North Atlantic Treaty Organization

Australian Research Council

Australian Department of Defence

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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