Analytical instruments for process control

Carr-Brion, K. G.

doi:10.1007/978-1-4613-2263-4_11

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…1 To have a healthy surrounding, it is fundamental to screen, identify, and control the surrounding humidity by advance humidity sensors. 2,3 Therefore, the requirements for healthy environmental conditions have prompted the advancements in humidity sensors by the utilization of chemical and physical characteristics of hybrid, inorganic, or organic materials. 4 Advancement in humidity sensory systems involves the improvement of transducer performance, for example, principle of mechanism, structure design, fabrication technologies, 5 and sensing elements.…”

Section: Introductionmentioning

confidence: 99%

Development of High-Performance Bismuth Sulfide Nanobelts Humidity Sensor and Effect of Humid Environment on its Transport Properties

et al. 2019

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Orthorhombic phase bismuth sulfide (Bi 2 S 3 ) nanobelts were prepared via liquid–solid phase reaction method. Bi 2 S 3 nanobelts were observed to be preferentially oriented along the (101) plane. Direct band gap (2.95 eV) and characteristic wavelength (λ max = 342 nm) were extracted through UV–visible spectroscopy. Specific surface area (9.8 m 2 /g) and pore size (2.5–120 nm) were evaluated through Brunauer–Emmett–Teller (BET) analysis. Relative humidity (RH) sensing properties were studied in the range of 11–97% RH at ambient conditions. The response of the sensor increases linearly with increase in RH. Fast response time (8–10 s) and recovery time (15 s) were observed. Reproducible and large response was also observed between 11 and 97% RH. Small hysteresis (<5%) and long-term stability during 30 days were confirmed. As a function of frequency, capacitance, alternating current conductivity, and electrical complex modulus in the frequency range of 20–2 MHz were studied at 11–97% RH. The sensing mechanism was also studied.

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Section: Introductionmentioning

confidence: 99%

Development of High-Performance Bismuth Sulfide Nanobelts Humidity Sensor and Effect of Humid Environment on its Transport Properties

et al. 2019

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“…There are many ways to determine micro-traces of water in gases. An excellent review of moisture measurement techniques has been published by Carr-Brion [2] and techniques for humidity measurement in semiconductor process gases have also been reviewed [3,4]. However, most of them are qualitative or semi-quantitative methods because of the lack of effective and reliable calibration methods using standard mixture gases with micro-traces of water because these mixtures are almost impossible to prepare in the concentrations required.…”

Section: Introductionmentioning

confidence: 99%

Determination of micro-traces of water in gases by a hydrogen gas sensor combined with a conversion reactor column

Zhou¹,

Zou²,

Gai³

2004

Meas. Sci. Technol.

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Micro-traces of water in gases have been determined by using a combination of a conversion reactor column and a high sensitivity hydrogen gas sensor (abbreviated here to CRHS-GC). A special purge installation was designed to clean the system with dried and purified liquid nitrogen. Micro-traces of water in gases first were introduced into the reactor column. The column was prepared by filling with a mixture of lithium and aluminium hydride (LiAlH 4 ) and glass fibre in a vacuum box, where the water present reacted with LiAlH 4 at about 60 • C. Hydrogen was released and determined by the hydrogen gas sensor, which was calibrated by a series of standard micro-trace hydrogen mixture gases. The experimental results showed that this method can be used to determine micro-traces of water in gases quickly, accurately and at a low cost. Only about 2-5 litres of sample were needed during each analysis. The method developed does not have the shortcoming of direct determination of micro-traces of water in gases that is caused by the absence of appropriate traceable calibration gases.

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Analytical instruments for process control

Cited by 2 publications

References 24 publications

Development of High-Performance Bismuth Sulfide Nanobelts Humidity Sensor and Effect of Humid Environment on its Transport Properties

Development of High-Performance Bismuth Sulfide Nanobelts Humidity Sensor and Effect of Humid Environment on its Transport Properties

Determination of micro-traces of water in gases by a hydrogen gas sensor combined with a conversion reactor column

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