http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : B. Renganathan (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Nanocrystalline cerium oxide coated fiber optic gas sensor
B. Renganathan,D. Sastikumar,A. Chandra Bose,R. Srinivasan,A.R. Ganesan 한국물리학회 2014 Current Applied Physics Vol.14 No.3
A clad-modified fiber optic sensor with nanocrystalline CeO2 is proposed for gas detection. As-prepared and annealed CeO2 (500 C) samples have been used as gas sensing media. The spectral characteristics of the fiber optic gas sensor are studied for various concentrations of ammonia, ethanol and methanol gases (0e500 ppm). The sensor exhibits linear variation in the spectral peak intensity with the gas concentration. The characteristics of the sensor are also studied for gas selectivity. The time response characteristics of the sensor are reported.
-
Gas sensing property of lithium tetraborate clad modified fiber optic sensor
R. Mohandoss,S. Dhanuskodi,B. Renganathan,D. Sastikumar 한국물리학회 2013 Current Applied Physics Vol.13 No.6
The micro structured plate-like lithium tetraborate, Li2B4O7 (1 mm in diameter) has been prepared by sol egel method and characterized structurally by X-ray diffraction and morphologically by scanning electron microscopy. UVeVis spectrum shows about 60% transparency in the visible region and the optical energy band gap is found to be 3.5 eV which is also confirmed by strong near band edge emission from luminescence spectrum. The spectral characteristics of the cladding modified fiber optic sensor coated with microcrystalline Li2B4O7 are studied for various concentrations of ethanol, methanol and ammonia (50e500 ppm). At 298 K, the sensitivity for ethanol is 10 counts/ppm which is relatively higher than ammonia (4 counts/ppm) and methanol (3 counts/ppm). The time response of the sensor is presented for pure Li2B4O7 with ethanol gas.
-
M. Parthibavarman,B. Renganathan,D. Sastikumar 한국물리학회 2013 Current Applied Physics Vol.13 No.7
We have successfully synthesized Co doped SnO2 nanoparticles by a simple microwave irradiation technique. Powder X-ray diffraction results reveal that the SnO2 doped with cobalt concentration from 0 to 5 wt % crystallizes in tetragonal rutile-type structure. The products were annealed at 600 ℃ for 5 h in ambient atmosphere in order to improve crystallinity and structural perfection. Transmission electron microscopy (TEM) studies illustrate that both the undoped and Co doped SnO2 crystallites form in spherical shapes with an average diameter of 30e15 nm, which is in good agreement with the average crystallite sizes calculated by Scherrer’s formula. A considerable red shift in the absorbing band edge was observed with increasing of Co content (0-5 wt %) by using UVeVis diffuse reflectance spectroscopy (DRS). Oxygen-vacancies, tin interstitial and structural defects were analyzed using photoluminescence (PL) spectroscopy. Electron paramagnetic resonance (EPR) spectroscopic studies clearly showed that the Co2+ was incorporated into the SnO2 host lattice. Ethanol gas sensitivity of pure and Co-doped (5 wt %)SnO2 nanoparticles were experimented at ambient temperature using optical fiber based on cladmodified method. By modifying the clad exposure to ethanol vapor, the sensitivities were estimated to be 18 and 30 counts/100 ppm for undoped and Co-doped SnO2 nanoparticles, respectively. These results show that the Co doping into SnO2 enhances its ethanol gas sensitivity significantly.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
