Browsing by Author "Meng, Tzu-Ching"

Now showing 1 - 3 of 3

Integrated semiconductor optoelectronic devices for real-time and indicator-free detection of aqueous nitric oxide
(2011-05-01)
Chao, Yu-Chiang
;
Yeh, Shih-De
;
Zan, Hsiao-Wen
;
Chang, Gao-Fong
;
Meng, Hsin-Fei
A real-time and indicator-free sensor specific to nitric oxide (NO) is realized for the first time by integrating a sensing hydrogel film, a top-emitting polymer light-emitting diode (PLED), and a silicon photodetector. The top-emitting PLED is utilized to excite the sensing film specific to NO, and the photoluminescence of the sensing film is transformed into electric signal by the photodetector. The influence of the excitation light on the out-put photocurrent of the photodetector is diminished by two delicately selected organic filters based on their absorption spectra. Lead phthalocyanine is deposited on a top-emitting PLED as a filter for generating an excitation light without overlapping the emission maximum of the sensing hydrogel film. Poly(3-hexylthiophene) is placed in front of the photodetector as another filter to remove the excitation light. This sensor demonstrated a fast photocurrent response to NO with response time within 5 min. (C) 2011 Elsevier B.V. All rights reserved.
Real-time and indicator-free detection of aqueous nitric oxide with hydrogel film
(2010-05-31)
Chao, Yu-Chiang
;
Yeh, Shih-De
;
Zan, Hsiao-Wen
;
Chang, Gao-Fong
;
Meng, Hsin-Fei
A sensing hydrogel film is demonstrated for real-time and indicator-free detection of nitric oxide (NO) in aqueous solution. The film composed of NO probe 11,16-bisphenyl-6,6,21,21-tetramethyl-m-benzi-6,21-porphodimetheno-chloro-zinc(II) and host polymer poly(2-hydroxyethyl methacrylate). The water-containing nature of this sensing hydrogel film makes the surface area high. The response time is bellow 10 s. This sensing hydrogel film also shows high selectivity, sensitivity, and stability in various pH values. (C) 2010 American Institute of Physics. [doi:10.1063/1.3425895]
Selective real-time nitric oxide detection by functionalized zinc oxide
(2009-08-07)
Liu, Chien-Cheng
;
Li, Jan-Hao
;
Chang, Cheng-Chung
;
Chao, Yu-Chiang
;
Meng, Hsin-Fei
Ferriprotoporphyrin IX chloride (haemin)-functionalized Al-doped zinc oxide (ZnO) is used for nitric oxide (NO) sensing at room temperature. The devices show high selectivity to NO against CO(2) and O(2). There is no such selectivity without haemin. Porous ZnO film made by a polystyrene sphere template is used to provide a high surface area. In comparison with non-porous ZnO film with low surface area, both the sensitivity and the response speed of the sensor made by porous ZnO are clearly improved. NO concentration down to 1 ppm can be detected. The response time is 20 s. The sensor is reversible after purging with pure nitrogen for about 100 s. Such a device is able to detect real-time variation of NO which is a vital physiological signalling molecule.