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A novel method to fabricate ion-doped microporous polyimide structures for ultra-high sensitive humidity sensing

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Title: A novel method to fabricate ion-doped microporous polyimide structures for ultra-high sensitive humidity sensing
Authors: Chen, Ching-Hsiu1, Lin, Che-Hsin chehsin@mail.nsysu.edu.tw
Source: Sensors & Actuators B: Chemical. Dec2008, Vol. 135 Issue 1, p276-282. 7p.
Subjects: Humidity, Detectors, Polyimides, Porous materials, Surface area, Acetates, Scanning electron microscopy
Abstract: Abstract: This research develops a fast, simple and reliable fabrication process for fabricating an ion-doped microporous polyimide (PI) membrane for ultra-high sensitive humidity sensing. The humidity sensing performance can be enhanced both by the high surface area of microporous PI film and the deliquescence property of the doped salt of potassium acetate. The porosity of polyimide membrane can be controlled by immersing the coated PI films in different concentrations of ethanol–water solution. SEM images confirm that the micropores interconnect with their neighboring pores and also open to the outside air. The EDS mapping results show that potassium acetate is successfully introduced into the microporous structure. The measured humidity sensitivity of the ion-doped microporous PI film (1.23wt% of potassium acetate doped) is over 100,000 times greater than the same PI film without pore and salt doping. Moreover, the proposed humidity sensor shows good linear capacitance response in the humidity range of 20–90% RH (R 2 =0.9525). A 72-h stability test also confirms the proposed humidity sensors have good long-term stability in 20% RH, 50% RH and 80% RH environments. [Copyright &y& Elsevier]
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: 35327079
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  Data: A novel method to fabricate ion-doped microporous polyimide structures for ultra-high sensitive humidity sensing
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Ching-Hsiu%22">Chen, Ching-Hsiu</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lin%2C+Che-Hsin%22">Lin, Che-Hsin</searchLink><i> chehsin@mail.nsysu.edu.tw</i>
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  Data: <searchLink fieldCode="JN" term="%22Sensors+%26+Actuators+B%3A+Chemical%22">Sensors & Actuators B: Chemical</searchLink>. Dec2008, Vol. 135 Issue 1, p276-282. 7p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Humidity%22">Humidity</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Polyimides%22">Polyimides</searchLink><br /><searchLink fieldCode="DE" term="%22Porous+materials%22">Porous materials</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+area%22">Surface area</searchLink><br /><searchLink fieldCode="DE" term="%22Acetates%22">Acetates</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electron+microscopy%22">Scanning electron microscopy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: This research develops a fast, simple and reliable fabrication process for fabricating an ion-doped microporous polyimide (PI) membrane for ultra-high sensitive humidity sensing. The humidity sensing performance can be enhanced both by the high surface area of microporous PI film and the deliquescence property of the doped salt of potassium acetate. The porosity of polyimide membrane can be controlled by immersing the coated PI films in different concentrations of ethanol–water solution. SEM images confirm that the micropores interconnect with their neighboring pores and also open to the outside air. The EDS mapping results show that potassium acetate is successfully introduced into the microporous structure. The measured humidity sensitivity of the ion-doped microporous PI film (1.23wt% of potassium acetate doped) is over 100,000 times greater than the same PI film without pore and salt doping. Moreover, the proposed humidity sensor shows good linear capacitance response in the humidity range of 20–90% RH (R 2 =0.9525). A 72-h stability test also confirms the proposed humidity sensors have good long-term stability in 20% RH, 50% RH and 80% RH environments. [Copyright &y& Elsevier]
– 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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      – Type: doi
        Value: 10.1016/j.snb.2008.08.034
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 276
    Subjects:
      – SubjectFull: Humidity
        Type: general
      – SubjectFull: Detectors
        Type: general
      – SubjectFull: Polyimides
        Type: general
      – SubjectFull: Porous materials
        Type: general
      – SubjectFull: Surface area
        Type: general
      – SubjectFull: Acetates
        Type: general
      – SubjectFull: Scanning electron microscopy
        Type: general
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      – TitleFull: A novel method to fabricate ion-doped microporous polyimide structures for ultra-high sensitive humidity sensing
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            NameFull: Chen, Ching-Hsiu
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            NameFull: Lin, Che-Hsin
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              Text: Dec2008
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              Y: 2008
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              Value: 135
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            – TitleFull: Sensors & Actuators B: Chemical
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