Impressing technology of optical Bragg’s gratings on planar optical sol-gel waveguides

2006 ◽  
Vol 14 (2) ◽  
Author(s):  
T. Pustelny ◽  
I. Zielonka ◽  
C. Tyszkiewicz ◽  
P. Karasiński ◽  
B. Pustelny
Keyword(s):  
Light Beam ◽  
Gas Sensors ◽  
Planar Waveguide ◽  
Sol Gel ◽  
Technical Problem ◽  
Waveguide Structure ◽  
Planar Waveguides ◽  
Optical Systems ◽  
Grating Couplers ◽  
Toxic Gases

AbstractThe aim of the presented investigations was to develop a technique of producing Bragg’s grating couplers on planar waveguides. Waveguides are obtained by means of the sol-gel technology. The introduction of a light beam into the structure of the waveguide is in the case of planar or strip optical systems always an essential technical problem, requiring simple and reproducible solutions without extending excessively the waveguide structure. The paper presents a technology of producing grating couplers by impressing the pattern of the network while forming the planar waveguide structure applying the sol-gel method. Some remarks concerning the sol-gel technology are also presented. The results of investigations on grating couplers obtained in such a way have been discussed, too.Attention has been drawn to the possibility of using such structures in optoelectronic sensors, particularly gas sensors, including sensors of water vapour as well as toxic gases.

scholarly journals Recent Progress of Toxic Gas Sensors Based on 3D Graphene Frameworks

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3386
Author(s):  
Qichao Dong ◽  
Min Xiao ◽  
Zengyong Chu ◽  
Guochen Li ◽  
Ye Zhang
Keyword(s):  
Gas Sensors ◽  
Recent Progress ◽  
Limit Of Detection ◽  
3D Structure ◽  
Ammonia Nitrogen ◽  
Gas Sensitivity ◽  
3D Graphene ◽  
Toxic Gases ◽  
Global Issue ◽  
Ppm Level

Air pollution is becoming an increasingly important global issue. Toxic gases such as ammonia, nitrogen dioxide, and volatile organic compounds (VOCs) like phenol are very common air pollutants. To date, various sensing methods have been proposed to detect these toxic gases. Researchers are trying their best to build sensors with the lowest detection limit, the highest sensitivity, and the best selectivity. As a 2D material, graphene is very sensitive to many gases and so can be used for gas sensors. Recent studies have shown that graphene with a 3D structure can increase the gas sensitivity of the sensors. The limit of detection (LOD) of the sensors can be upgraded from ppm level to several ppb level. In this review, the recent progress of the gas sensors based on 3D graphene frameworks in the detection of harmful gases is summarized and discussed.

scholarly journals Decoration of CuO NWs Gas Sensor with ZnO NPs for Improving NO2 Sensing Characteristics

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2103 ◽  
Author(s):  
Tae-Hee Han ◽  
So-Young Bak ◽  
Sangwoo Kim ◽  
Se Hyeong Lee ◽  
Ye-Ji Han ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Sol Gel ◽  
Oxide Semiconductor ◽  
Zno Nps ◽  
X Ray ◽  
Semiconductor Gas Sensor ◽  
Initial Resistance ◽  
P Type ◽  
Sensing Characteristics

This paper introduces a method for improving the sensitivity to NO2 gas of a p-type metal oxide semiconductor gas sensor. The gas sensor was fabricated using CuO nanowires (NWs) grown through thermal oxidation and decorated with ZnO nanoparticles (NPs) using a sol-gel method. The CuO gas sensor with a ZnO heterojunction exhibited better sensitivity to NO2 gas than the pristine CuO gas sensor. The heterojunction in CuO/ZnO gas sensors caused a decrease in the width of the hole accumulation layer (HAL) and an increase in the initial resistance. The possibility to influence the width of the HAL helped improve the NO2 sensing characteristics of the gas sensor. The growth morphology, atomic composition, and crystal structure of the gas sensors were analyzed using field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy, and X-ray diffraction, respectively.

Semiconducting Nano-structured SmFeO3-based Thin Films Prepared by Novel Sol-gel Method for Acetone Gas Sensors

2014 ◽  
Vol 152 (1) ◽  
pp. 29-35 ◽  
Author(s):  
Ying Zhang ◽  
Qian-Qian Jia ◽  
Hui-Ming Ji ◽  
Jian-Jun Yu
Keyword(s):  
Thin Films ◽  
Gas Sensors ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

CuOX Films for NO2 Detection: Microstructural Characterization

2013 ◽  
Vol 481 ◽  
pp. 133-136 ◽  
Author(s):  
T.N. Myasoedova ◽  
G.E. Yalovega ◽  
N.K. Plugotarenko ◽  
M. Brzhezinskaya ◽  
V.V. Petrov ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Secondary Electron ◽  
Operating Temperature ◽  
Sol Gel ◽  
Microstructural Characterization ◽  
Temperature Treatment ◽  
Copper Oxides ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

Copper oxides films as promising materials for gas sensors applications were studied. Copper oxide films were deposited onto Si/SiO2substrates using a citrate sol-gel method with the subsequent temperature treatment at 150-5000C. These films were characterized by means of secondary electron microscopy (SEM) and X-ray-absorption near-edge structure (XANES) spectroscopy. The prepared films were utilized in NO2sensors. The dependences of the NO2response on the operating temperature and NO2concentration (10-200 ppm) were investigated. The maximum NO2response was achieved for the film annealed at 2500C.

Erbium-activated silica–zirconia planar waveguides prepared by sol–gel route

2008 ◽  
Vol 516 (10) ◽  
pp. 3094-3097 ◽  
Author(s):  
Rogéria R. Gonçalves ◽  
Younes Messaddeq ◽  
Alessandro Chiasera ◽  
Yoann Jestin ◽  
Maurizio Ferrari ◽  
...  
Keyword(s):  
Sol Gel ◽  
Planar Waveguides
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