scholarly journals Mesoporous anodic α-Fe2O3 interferometer for organic vapor sensing application

RSC Advances ◽  
2018 ◽  
Vol 8 (54) ◽  
pp. 31121-31128 ◽  
Author(s):  
Feng-Xia Liang ◽  
Lin Liang ◽  
Xing-Yuan Zhao ◽  
Xiao-Wei Tong ◽  
Ji-Gang Hu ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Organic Vapors ◽  
Organic Vapor ◽  
Vapor Sensing ◽  
Sensing Application

Mesoporous α-Fe2O3 interferometers with well-resolved optical fringes can display high sensitivity to organic vapors.

Fabrication of picoline amide-based calix[4]arene Langmuir-Blodgett thin film for volatile organic vapor sensing application

2020 ◽  
Vol 710 (1) ◽  
pp. 49-65
Author(s):  
Cansu Ozkaya ◽  
Rifat Capan ◽  
Matem Erdogan ◽  
Mevlut Bayrakci ◽  
Mustafa Ozmen ◽  
...  
Keyword(s):  
Thin Film ◽  
Langmuir Blodgett ◽  
Organic Vapor ◽  
Vapor Sensing ◽  
Volatile Organic ◽  
Sensing Application

scholarly journals A Novel Chemical Gas Vapor Sensor Based on Photoluminescence Enhancement of Rugate Porous Silicon Filters

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2722
Author(s):  
Zicheng Zhou ◽  
Honglae Sohn
Keyword(s):  
Porous Silicon ◽  
Electrochemical Etching ◽  
Photoluminescence Intensity ◽  
Organic Vapors ◽  
Organic Vapor ◽  
Vapor Sensing ◽  
Enhanced Photoluminescence ◽  
Vapor Sensor ◽  
Rugate Filter ◽  
Pl Quenching

In this study, an innovative rugate filter configuration porous silicon (PSi) with enhanced photoluminescence intensity was fabricated. The fabricated PSi exhibited dual optical properties with both sharp optical reflectivity and sharp photoluminescence (PL), and it was developed for use in organic vapor sensing. When the wavelength of the resonance peak from the rugate PSi filters is engineered to overlap with the emission band of the PL from the PSi quantum dots, the PL intensity is amplified, thus reducing the full width at half maximum (FWHM) of the PL band from 154 nm to 22 nm. The rugate PSi filters samples were fabricated by electrochemical etching of highly doped n-type silicon under illumination. The etching solution consisted of a 1:1 volume mixture of 48% hydrofluoric acid and absolute ethanol and photoluminescent rugate PSi filter was fabricated by etching while using a periodic sinusoidal wave current with 10 cycles. The obtained samples were characterized by scanning electron microscopy (SEM), and both reflection redshift and PL quenching were measured under exposure to organic vapors. The reflection redshift and PL quenching were both affected by the vapor pressure and dipole moment of the organic species.

Fast and Reversible Chemiresistive Sensors for Robust Detection of Organic Vapors Using Oleylamine-Functionalized Palladium Nanoparticles

2018 ◽  
Vol 27 (03n04) ◽  
pp. 1840027 ◽  
Author(s):  
Tuo Gao ◽  
Yongchen Wang ◽  
Yi Luo ◽  
Chengwu Zhang ◽  
Zachariah Pittman ◽  
...  
Keyword(s):  
Palladium Nanoparticles ◽  
Volume Ratio ◽  
Principal Component ◽  
Organic Vapors ◽  
Robust Detection ◽  
Multiple Sensors ◽  
Hydrogen Sensing ◽  
Organic Vapor ◽  
Vapor Sensing ◽  
Accuracy And Precision

Chemiresistive sensors fabricated by oleylamine-functionalized palladium nanoparticles (OLA-PdNP) have been studied in hydrogen sensing, but not so much in organic vapor sensing. Like the extensively studied gold nanoparticles-based gas sensors, palladium nanoparticles also give the ease of surface modification and large surface-area-to-volume ratio. In this study, we demonstrate an OLA-PdNP chemiresistor array with robust sensor responses (1-15% of ΔR/R0) and accurate discrimination of six organic vapors at a concentration of p/p0 = 0.2, using principal component analysis (PCA). Each microfabricated 36 mm2 chip has 36 individual sensors. By incorporating multiple sensors on one chip, the sensor response gives a distinguishable pattern for each analyte. From this study, an electronic chemical spectrometer can be further developed by incorporating many types of ligands on palladium metal core to enhance sensor accuracy and precision.

scholarly journals Preparation of Zinc(II) Phthalocyanine-Based LB Thin Film: Experimental Characterization, the Determination of Optical Properties and Harmful Organic Vapor Sensing Ability

2021 ◽  
Author(s):  
Yaser Acikbas ◽  
Matem Erdogan ◽  
Rifat Capan ◽  
Cansu Ozkaya ◽  
Yasemin Baygu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Experimental Characterization ◽  
Organic Vapors ◽  
Langmuir Blodgett ◽  
Organic Vapor ◽  
Lb Film ◽  
Vapor Sensing ◽  
First Time

Abstract Zinc(II) phthalocyanine (Zn(II)Pc) molecule was the first time prepared onto three different substrates utilizing Langmuir-Blodgett (LB) deposition technique to investigate its vapor sensing abilities and some optical properties. We utilized five different and well-known techniques to control monolayer quality of Zn(II)Pc LB film. The obtained the thickness and refractive index values for Zn(II)Pc LB film with coated at different layers vary from 3.2 to 10.9 nm and from 1.42 to 1.71, respectively. The sensing properties were investigated by exposing the Zn(II)Pc-based mass or optical sensor to some organic vapors. Kinetic results presented that this Zn(II)Pc material is a good candidate as a sensor element with a fast and reversible response for dichloromethane sensing devices.

scholarly journals Parametric Studies on ArtificialMorphoButterfly Wing Scales for Optical Device Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Hyun Myung Kim ◽  
Sang Hyeok Kim ◽  
Gil Ju Lee ◽  
Kyujung Kim ◽  
Young Min Song
Keyword(s):  
Gallium Phosphide ◽  
High Sensitivity ◽  
Membrane Thickness ◽  
Light Sources ◽  
Vapor Sensing ◽  
Reflected Light ◽  
Device Applications ◽  
Parametric Studies ◽  
Geometrical Effects ◽  
Rigorous Coupled Wave

We calculated diffraction efficiencies of grating structures inspired byMorphobutterfly wings by using a rigorous coupled-wave analysis method. The geometrical effects, such as grating width, period, thickness, and material index, were investigated in order to obtain better optical performance. Closely packed grating structures with an optimized membrane thickness show vivid reflected colors and provide high sensitivity to surrounding media variations, which is applicable to vapor sensing or healthcare indicators.Morphostructures with high index materials such as zinc sulfide or gallium phosphide generate white color caused by broadband reflection that can be used as reflected light sources for display applications.

Fully integrated bio‐chip with high sensitivity for electrochemical sensing application

2019 ◽  
Vol 55 (8) ◽  
pp. 438-440
Author(s):  
W.‐H. Chen ◽  
C.‐H. Chang ◽  
H.‐Y. Shih ◽  
T.‐W. Chiu ◽  
C.‐N. Kuo
Keyword(s):  
High Sensitivity ◽  
Electrochemical Sensing ◽  
Fully Integrated ◽  
Sensing Application
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