Emerging material zinc magnesium oxide based nanorods: Growth process optimization and sensor application towards humidity detection

Punam Murkute; Hemant Ghadi; Sheetal Patil; Harshal Rawool; Sushilkumar Pandey; Subhananda Chakrabarti

doi:10.1016/j.snb.2017.10.078

Emerging material zinc magnesium oxide based nanorods: Growth process optimization and sensor application towards humidity detection

Punam Murkute, Hemant Ghadi, Sheetal Patil, Harshal Rawool, Sushilkumar Pandey, Subhananda Chakrabarti

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

In this paper, we provide a detailed investigation on the optical and physical properties of self-assembled Zinc magnesium oxide (Zn_0.85Mg_0.15O) based nanostructures which is an emerging material for optoelectronic devices. An enhancement was observed in the optical and material properties of vertically aligned highly crystalline Zn_0.85Mg_x0.15O nanorods grown using site nucleated hydrothermal treatment. Various parameters such as, the molar ratio of zinc nitrate hexahydrate, hexamethylenetetramine and growth time were optimized to achieve high-density of the nanorods. Photoluminescence (PL) measurement at 18 K revealed a peak at 3.61 eV corresponding to excitonic near-band-edge (NBE) emission from ‘As annealed’ sample and a peak with low intensity at 3.37 eV confirming the presence of another phase (ZnO) in grown nanorods. X-Ray diffraction (XRD) spectra of Zn_0.85Mg_0.15O samples showed highly c-axis-oriented growth with dominant 〈002〉 peak making them ideal for gas/humidity sensing applications. Room temperature PL spectrum exhibited reduction in defect states peak with increasing relative humidity levels. DC Current-Voltage characteristics showed increase in current intensity after exposing the sample to controlled relative humidity (RH). The proposed Zn_1-xMg_xO based sensor exhibited high sensitivity 1.503%/RH for change in RH and response time ∼ 7–8 min.

Original language	English (US)
Pages (from-to)	204-216
Number of pages	13
Journal	Sensors and Actuators, B: Chemical
Volume	256
DOIs	https://doi.org/10.1016/j.snb.2017.10.078
State	Published - Mar 2018

Bibliographical note

Funding Information:
The authors acknowledge the financial support from the Department of Science and Technology, India and the partial financial support from the Department of Information Technology . Authors acknowledge Indian Institute of Technology Bombay Nanofabrication (IITBNF) and SAIF facility at IIT Bombay to carry out the corresponding experiments. Author Sheetal Patil would like to acknowledge the funding support received from the Department of Science and Technology (DST), Government of India , through the Women Scientist Scheme (WOS-A). Appendix A

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Humidity detection
Optical materials and properties
Optical sensor
Process optimization
Zinc magnesium oxide

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title = "Emerging material zinc magnesium oxide based nanorods: Growth process optimization and sensor application towards humidity detection",

abstract = "In this paper, we provide a detailed investigation on the optical and physical properties of self-assembled Zinc magnesium oxide (Zn0.85Mg0.15O) based nanostructures which is an emerging material for optoelectronic devices. An enhancement was observed in the optical and material properties of vertically aligned highly crystalline Zn0.85Mgx0.15O nanorods grown using site nucleated hydrothermal treatment. Various parameters such as, the molar ratio of zinc nitrate hexahydrate, hexamethylenetetramine and growth time were optimized to achieve high-density of the nanorods. Photoluminescence (PL) measurement at 18 K revealed a peak at 3.61 eV corresponding to excitonic near-band-edge (NBE) emission from {\textquoteleft}As annealed{\textquoteright} sample and a peak with low intensity at 3.37 eV confirming the presence of another phase (ZnO) in grown nanorods. X-Ray diffraction (XRD) spectra of Zn0.85Mg0.15O samples showed highly c-axis-oriented growth with dominant 〈002〉 peak making them ideal for gas/humidity sensing applications. Room temperature PL spectrum exhibited reduction in defect states peak with increasing relative humidity levels. DC Current-Voltage characteristics showed increase in current intensity after exposing the sample to controlled relative humidity (RH). The proposed Zn1-xMgxO based sensor exhibited high sensitivity 1.503%/RH for change in RH and response time ∼ 7–8 min.",

keywords = "Humidity detection, Optical materials and properties, Optical sensor, Process optimization, Zinc magnesium oxide",

author = "Punam Murkute and Hemant Ghadi and Sheetal Patil and Harshal Rawool and Sushilkumar Pandey and Subhananda Chakrabarti",

note = "Funding Information: The authors acknowledge the financial support from the Department of Science and Technology, India and the partial financial support from the Department of Information Technology . Authors acknowledge Indian Institute of Technology Bombay Nanofabrication (IITBNF) and SAIF facility at IIT Bombay to carry out the corresponding experiments. Author Sheetal Patil would like to acknowledge the funding support received from the Department of Science and Technology (DST), Government of India , through the Women Scientist Scheme (WOS-A). Appendix A Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

month = mar,

doi = "10.1016/j.snb.2017.10.078",

language = "English (US)",

volume = "256",

pages = "204--216",

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T1 - Emerging material zinc magnesium oxide based nanorods

T2 - Growth process optimization and sensor application towards humidity detection

AU - Murkute, Punam

AU - Ghadi, Hemant

AU - Patil, Sheetal

AU - Rawool, Harshal

AU - Pandey, Sushilkumar

AU - Chakrabarti, Subhananda

N1 - Funding Information: The authors acknowledge the financial support from the Department of Science and Technology, India and the partial financial support from the Department of Information Technology . Authors acknowledge Indian Institute of Technology Bombay Nanofabrication (IITBNF) and SAIF facility at IIT Bombay to carry out the corresponding experiments. Author Sheetal Patil would like to acknowledge the funding support received from the Department of Science and Technology (DST), Government of India , through the Women Scientist Scheme (WOS-A). Appendix A Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/3

Y1 - 2018/3

N2 - In this paper, we provide a detailed investigation on the optical and physical properties of self-assembled Zinc magnesium oxide (Zn0.85Mg0.15O) based nanostructures which is an emerging material for optoelectronic devices. An enhancement was observed in the optical and material properties of vertically aligned highly crystalline Zn0.85Mgx0.15O nanorods grown using site nucleated hydrothermal treatment. Various parameters such as, the molar ratio of zinc nitrate hexahydrate, hexamethylenetetramine and growth time were optimized to achieve high-density of the nanorods. Photoluminescence (PL) measurement at 18 K revealed a peak at 3.61 eV corresponding to excitonic near-band-edge (NBE) emission from ‘As annealed’ sample and a peak with low intensity at 3.37 eV confirming the presence of another phase (ZnO) in grown nanorods. X-Ray diffraction (XRD) spectra of Zn0.85Mg0.15O samples showed highly c-axis-oriented growth with dominant 〈002〉 peak making them ideal for gas/humidity sensing applications. Room temperature PL spectrum exhibited reduction in defect states peak with increasing relative humidity levels. DC Current-Voltage characteristics showed increase in current intensity after exposing the sample to controlled relative humidity (RH). The proposed Zn1-xMgxO based sensor exhibited high sensitivity 1.503%/RH for change in RH and response time ∼ 7–8 min.

AB - In this paper, we provide a detailed investigation on the optical and physical properties of self-assembled Zinc magnesium oxide (Zn0.85Mg0.15O) based nanostructures which is an emerging material for optoelectronic devices. An enhancement was observed in the optical and material properties of vertically aligned highly crystalline Zn0.85Mgx0.15O nanorods grown using site nucleated hydrothermal treatment. Various parameters such as, the molar ratio of zinc nitrate hexahydrate, hexamethylenetetramine and growth time were optimized to achieve high-density of the nanorods. Photoluminescence (PL) measurement at 18 K revealed a peak at 3.61 eV corresponding to excitonic near-band-edge (NBE) emission from ‘As annealed’ sample and a peak with low intensity at 3.37 eV confirming the presence of another phase (ZnO) in grown nanorods. X-Ray diffraction (XRD) spectra of Zn0.85Mg0.15O samples showed highly c-axis-oriented growth with dominant 〈002〉 peak making them ideal for gas/humidity sensing applications. Room temperature PL spectrum exhibited reduction in defect states peak with increasing relative humidity levels. DC Current-Voltage characteristics showed increase in current intensity after exposing the sample to controlled relative humidity (RH). The proposed Zn1-xMgxO based sensor exhibited high sensitivity 1.503%/RH for change in RH and response time ∼ 7–8 min.

KW - Humidity detection

KW - Optical materials and properties

KW - Optical sensor

KW - Process optimization

KW - Zinc magnesium oxide

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DO - 10.1016/j.snb.2017.10.078

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JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

ER -

Emerging material zinc magnesium oxide based nanorods: Growth process optimization and sensor application towards humidity detection

Abstract

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Keywords

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