✦ LIBER ✦

Optical humidity and ammonia gas sensor using calcein-based films

✍ Scribed by Yoshihiko Sadaoka; Yoshiro Sakai; Yu-uki Murata

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 348 KB
Volume: 13
Category: Article
ISSN: 0925-4005
DOI: 10.1016/0925-4005(93)85416-8

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Optical Fiber-Based Sensor for Calcium U

Optical Fiber-Based Sensor for Calcium Using Hydrophobically Associated Calcein and Laser-Induced Fluorescence Detection

✍ Y.L. Wang; J.M. Baten; S.P. Mcmaughan; D.R. Bobbitt 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 659 KB

Optical-fibre and quartz oscillator type

Optical-fibre and quartz oscillator type gas sensors: Humidity detection by Nafion® film with crystal violet and related compounds

✍ Y. Sadaoka; M. Matsuguchi; Y. Sakai 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 293 KB

By using Nafion@ film with crystal violet and malachite green, an optical-fibre and quartz oscillator type humidity sensor has been fabricated. The optical intensity, with a minimum at 615 nm in the reflection mode, decreases with relative humidity for a film with malachite green. The rise and recov

Oxygen interaction of CdS-based gas sens

Oxygen interaction of CdS-based gas sensors with different stoichiometric compositions was studied by X-ray photoelectron spectroscopy (XPS) and thermal-desorption mass spectroscopy observations combined with conductivity measurements. Three different types of film with different atomic ratios of Cd/S were used in the study of oxygen chemisorption in a low-temperature range between 300 and 570 K. Spray pyrolysis was used for the deposition of the films on glass substrates; XPS and energy dispersive spectroscopy of X-ray together with atomic force microscopy and scanning electron microscopy were used for the characterization of the composition and structure of the films. It was possible to distinguish different temperature ranges for the thermal desorption of the different adsorbed oxygen species. A comparison of the data from XPS and mass-spectroscopy observations with conductance measurements allows to conclude that metallic surface atoms are responsible for different interactions of oxygen species with CdS surfaces.

📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 379 KB