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The enhanced performance of capacitive-type humidity sensors based on ZnO nanorods/WS2 nanosheets heterostructure.

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Title: The enhanced performance of capacitive-type humidity sensors based on ZnO nanorods/WS2 nanosheets heterostructure.
Authors: Dwiputra, Muhammad Adam1 (AUTHOR), Fadhila, Farah1 (AUTHOR), Imawan, Cuk1 (AUTHOR), Fauzia, Vivi1 (AUTHOR) vivi@sci.ui.ac.id
Source: Sensors & Actuators B: Chemical. May2020, Vol. 310, pN.PAG-N.PAG. 1p.
Subjects: Zinc oxide synthesis, Electric charge, Humidity, Zinc oxide, Indium tin oxide, Physisorption, Detectors, Tungsten alloys
Abstract: • The novel capacitive-type humidity sensor based on ZnO nanorods/WS 2 nanosheets heterostructure was proposed. • The presence of WS 2 increased the response and sensitivity and lowered the hysteresis without impacting response and recovery times. • The improved sensor performance might be due to the ability of WS 2 to provide more water molecule adsorption sites. • The interface of ZnO/WS 2 contains high local charge density and an internal electric field that increase the water dissociation rate. Zinc oxide (ZnO) is a promising candidate for humidity-sensing materials due to its low-cost preparation, superior chemical and thermal stability, controllable surface morphology, and low water solubility. However, pristine ZnO-based humidity sensors suffer from poor response and large hysteresis that limit their application. In this study, n-type semiconducting tungsten disulfide (WS 2) was utilized to form ZnO nanorods/WS 2 nanosheets heterostructure grown on indium tin oxide coplanar electrode-coated glass substrate. The capacitive-type humidity sensing characteristics were investigated at room temperature. The results show that for humidity ranges of 18–85 % RH, three deposition cycles of WS 2 nanosheets onto ZnO nanorods produced significant improvements in the response, sensitivity, and hysteresis with an unchanged response and recovery times compared to pristine ZnO sensors. This improved sensor performance might be due to the ability of WS 2 to provide more water molecule adsorption sites. The formation of an n-n junction between ZnO and WS 2 created interfaces with high local charge density and built an internal electric field that increase the water dissociation rate. The improved hysteresis might be due to water molecule adsorption on WS 2 nanosheets is physical adsorption that facilitates the desorption process. [ABSTRACT FROM AUTHOR]
Copyright of Sensors & Actuators B: Chemical is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 142206287
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  Data: The enhanced performance of capacitive-type humidity sensors based on ZnO nanorods/WS2 nanosheets heterostructure.
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  Data: <searchLink fieldCode="AR" term="%22Dwiputra%2C+Muhammad+Adam%22">Dwiputra, Muhammad Adam</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fadhila%2C+Farah%22">Fadhila, Farah</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Imawan%2C+Cuk%22">Imawan, Cuk</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fauzia%2C+Vivi%22">Fauzia, Vivi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> vivi@sci.ui.ac.id</i>
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  Data: <searchLink fieldCode="JN" term="%22Sensors+%26+Actuators+B%3A+Chemical%22">Sensors & Actuators B: Chemical</searchLink>. May2020, Vol. 310, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Zinc+oxide+synthesis%22">Zinc oxide synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+charge%22">Electric charge</searchLink><br /><searchLink fieldCode="DE" term="%22Humidity%22">Humidity</searchLink><br /><searchLink fieldCode="DE" term="%22Zinc+oxide%22">Zinc oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Indium+tin+oxide%22">Indium tin oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Physisorption%22">Physisorption</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Tungsten+alloys%22">Tungsten alloys</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • The novel capacitive-type humidity sensor based on ZnO nanorods/WS 2 nanosheets heterostructure was proposed. • The presence of WS 2 increased the response and sensitivity and lowered the hysteresis without impacting response and recovery times. • The improved sensor performance might be due to the ability of WS 2 to provide more water molecule adsorption sites. • The interface of ZnO/WS 2 contains high local charge density and an internal electric field that increase the water dissociation rate. Zinc oxide (ZnO) is a promising candidate for humidity-sensing materials due to its low-cost preparation, superior chemical and thermal stability, controllable surface morphology, and low water solubility. However, pristine ZnO-based humidity sensors suffer from poor response and large hysteresis that limit their application. In this study, n-type semiconducting tungsten disulfide (WS 2) was utilized to form ZnO nanorods/WS 2 nanosheets heterostructure grown on indium tin oxide coplanar electrode-coated glass substrate. The capacitive-type humidity sensing characteristics were investigated at room temperature. The results show that for humidity ranges of 18–85 % RH, three deposition cycles of WS 2 nanosheets onto ZnO nanorods produced significant improvements in the response, sensitivity, and hysteresis with an unchanged response and recovery times compared to pristine ZnO sensors. This improved sensor performance might be due to the ability of WS 2 to provide more water molecule adsorption sites. The formation of an n-n junction between ZnO and WS 2 created interfaces with high local charge density and built an internal electric field that increase the water dissociation rate. The improved hysteresis might be due to water molecule adsorption on WS 2 nanosheets is physical adsorption that facilitates the desorption process. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Sensors & Actuators B: Chemical is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.snb.2020.127810
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Zinc oxide synthesis
        Type: general
      – SubjectFull: Electric charge
        Type: general
      – SubjectFull: Humidity
        Type: general
      – SubjectFull: Zinc oxide
        Type: general
      – SubjectFull: Indium tin oxide
        Type: general
      – SubjectFull: Physisorption
        Type: general
      – SubjectFull: Detectors
        Type: general
      – SubjectFull: Tungsten alloys
        Type: general
    Titles:
      – TitleFull: The enhanced performance of capacitive-type humidity sensors based on ZnO nanorods/WS2 nanosheets heterostructure.
        Type: main
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            NameFull: Dwiputra, Muhammad Adam
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            NameFull: Fadhila, Farah
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            NameFull: Imawan, Cuk
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            NameFull: Fauzia, Vivi
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            – D: 01
              M: 05
              Text: May2020
              Type: published
              Y: 2020
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              Value: 310
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            – TitleFull: Sensors & Actuators B: Chemical
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