Glass modified sensitive surface thick film humidity sensor

Gwirc, Sergio N.

doi:10.1016/0925-4005(94)87067-5

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…This last layer is applied during the manufacturing process, before polarizing the film. We used a commercial glass paste, IP9025 from Cermalloy Heraeus, which was baked at 600 ° C [9]. Over this thin glass layer we placed a traditional backing, with the usual procedure.…”

Section: Acoustic Pulsed Responsementioning

confidence: 99%

Ultrasonic array of thick film transducers for biological tissue characterization

Gwirc¹,

Negreira

Marino³

2010

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology

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The initial motivation for this work was to accomplish an easy way to manufacture different geometries of ultrasonic transducers and arrays using a PZT powder, combined with a standard process to have repetitive series of them. The piezoelectric thick film was obtained using a PZT paste and applying it by screen printing on an alumina substrate. Then, the film was drying and sintered with a temperature-time profile determined by the paste characteristics. Each transducer is composed by three layers, one by PZT and two acting as electrodes. The active element of the paste is a PZT powder which is dispersed in a commercial vehicle to obtain rheological properties suitable for use the screen printing process. The connection between PZT particles is improved by adding a lead borosilicate frit glass that also helps to attach the film to the substrate due to the relatively low temperature of sintered that has been used in this process. The PZT film has low density that is generated by internal porosity, so its acoustic impedance is lower than for a bulk ceramic transducer and so is well adapted to testing human tissues. At the same time the thick film technology is well suited to make medium size transducers and also arrays performed with tiny ultrasonic transducers.

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Section: Acoustic Pulsed Responsementioning

confidence: 99%

Ultrasonic array of thick film transducers for biological tissue characterization

Gwirc¹,

Negreira

Marino³

2010

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology

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“…In glasses or ceramics as sensing materials, the variation of their electrical properties, such as impedance or capacitance, is exploited for gas detection. There are, however, few papers dealing with glass ceramics as humidity [9] and gas sensors [10,11,12,13,14,15,16]. Thus, based on previous experiences [17,18], in this research, ZnO crystals were grown from a glassy matrix having the composition 58ZnO:4WO 3 :4Bi2O3:33.3B 2 O 3 by means of a crystallization process.…”

Section: Introductionmentioning

confidence: 99%

New ZnO-Based Glass Ceramic Sensor for H2 and NO2 Detection

Hassan¹,

Afify

Ataalla

et al. 2017

Sensors

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In this study, a glass ceramic with a nominal composition 58ZnO:4Bi2O3:4WO3:33.3B2O3 was synthesized by melt quenching technique. A gas sensor was then manufactured using a ZnO sol-gel phase as a permanent binder of the glass–ceramic to an alumina substrate having interdigitated electrodes. The film sensitivity towards humidity, NH3, H2 and NO2 was studied at different temperatures. X-ray diffraction technique (XRD), field emission- scanning electron microscopy (FE-SEM) and differential thermal analysis (DTA) were used to characterize the prepared material. Though the response in the sub-ppm NO2 concentration range was not explored, the observed results are comparable with the latest found in the literature.

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