Humidity sensor using sol—gel-derived silica coating on quartz crystal

Sun, Hong‐Tao; Cheng, Zhitao; Yao, Xi; Włodarski, Wojciech

doi:10.1016/0925-4005(93)85336-9

Cited by 30 publications

(11 citation statements)

References 4 publications

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“…Processability of such designs, however, can be somewhat tedious requiring high temperatures and a multilayered construction to the sensor substrate. The use of sol-gels has improved this processability [10][11][12][13][14], but most designs still require a glass or quartz crystal substrate which can restrict the degree of miniaturisation.…”

Section: Introductionmentioning

confidence: 99%

Micro-humidity sensors based on a processable polyaniline blend

McGovern

Spinks

Wallace

2005

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

Micro-humidity sensors based on a processable polyaniline blend

McGovern

Spinks

Wallace

2005

Sensors and Actuators B: Chemical

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“…It has been used as gas sensors [15][16][17][18], liquid phase ion sensors [19][20][21][22][23][24][25][26][27], biosensors [22,23], DNA reaction monitors [24] and so on. The QCM technology incorporated with humidity sensitive material is a good solution for humidity sensing application [3,4,6]. Various kinds of polymer coatings are reported as the sensing material, but the large hysteresis and the narrow active range are the main problems to be overcome.…”

Section: Introductionmentioning

confidence: 99%

“…Various principles, capacitive, resistive, gravimetric, microwave, etc. [3][4][5][6][7], have so far been investigated for humidity sensors, by employing different kinds of sensing materials, such as metal oxides, polymers and porous inorganic/organic materials [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Humidity sensitive properties of ZnO nanotetrapods investigated by a quartz crystal microbalance

Wang

Ding

Zhang

et al. 2006

Sensors and Actuators B: Chemical

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“…Processability of such designs however can be somewhat tedious requiring high temperatures and a multi layered construction to the sensor substrate. The use of sol-gels has improved this processability [15][16][17][18][19] but most designs still require a glass or quartz crystal substrate which can restrict the degree of miniaturisation.…”

Section: Introductionmentioning

confidence: 99%

Highly processable method for the construction of miniature conducting polymer moisture sensors

McGovern

Spinks

Wallace

2005

Smart Structures, Devices, and Systems II

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A polymer blend incorporating polyaniline (PAn) was used as a sensing medium in the construction of a resistance based humidity sensor. Aniline monomer was polymerised to PAn emeraldine salt (ES) in the presence of poly (butyl acrylate-co-vinyl acetate) and the processable blend was developed by redissolving 1-2 w/w% of the resulting sensing polymer residue in dichloromethane (DCM). Some of this residue was washed in ammonia solution to de-dope the PAn to emeraldine base (EB) to act as a protective layer on the surface of the sensing polymer. This residue was then washed with distilled water until a neutral pH was realised with the waste water, dried and redissolved in DCM at 1-2 w/w% to create a processable blend barrier polymer solution. The final sensor design utilised 125µm polyester insulated platinum wire as conducting electrodes that were dip coated in the PAn ES blend solution and dried in a desiccator. A protective coating was then applied by dip coating in the EB blend solution. The sensors had an overall final thickness of less than 200µm and showed high sensitivity to humidity, low resistance, and good reversibility without hysteresis. The EB protective layer was shown to give more stable and predictable responses to the sensors when placed inside curing epoxies. Polymer based thin film humidity sensors have the advantage that the high processability of the material allows for simple fabrication of a range of geometries including smaller sensor designs. Such sensors may find uses in detecting water content in a number of areas including composite materials, electronic textiles, food/ electronics packaging and corrosion detection.

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Humidity sensor using sol—gel-derived silica coating on quartz crystal

Cited by 30 publications

References 4 publications

Micro-humidity sensors based on a processable polyaniline blend

Micro-humidity sensors based on a processable polyaniline blend

Humidity sensitive properties of ZnO nanotetrapods investigated by a quartz crystal microbalance

Highly processable method for the construction of miniature conducting polymer moisture sensors

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