scholarly journals Scotch Tape Optical Vapor Sensor for Ethanol–Methanol Mixtures

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5381 ◽  
Author(s):  
Carlos Angulo Barrios
Keyword(s):  
Optical Power ◽  
Ethanol Vapor ◽  
Liquid Mixtures ◽  
Adhesive Tape ◽  
Vapor Sorption ◽  
Methanol Vapor ◽  
Detection Range ◽  
Linear Detection ◽  
Volatile Organic ◽  
Vapor Sensor

A simple optical vapor sensor based on conventional Scotch adhesive tape, for analyzing ethanol–methanol mixtures, is proposed and demonstrated. The sensing signal relies on the variation of optical power transmitted through the tape, resulting from the response of the adhesive material to vapor sorption. The optical sensor exhibits high selectivity for ethanol vapor over methanol vapor. When exposed to vapors from ethanol–methanol liquid mixtures, the sensor shows a linear detection range of 0–100 vol%, and detection limits of 8.8 vol% ethanol and 17.6 vol% methanol. Repeatability, reproducibility, reversibility, and sensitivity to other volatile organic compounds are also studied.

scholarly journals Label-Free Electrochemical Biosensor Based on Au@MoS₂–PANI for Escherichia coli Detection

Chemosensors ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 49
Author(s):  
Pushap Raj ◽  
Man Hwan Oh ◽  
Kyudong Han ◽  
Tae Yoon Lee
Keyword(s):  
Escherichia Coli ◽  
Bacterial Infections ◽  
Limit Of Detection ◽  
Bacterial Pathogens ◽  
Cost Effective ◽  
Covalent Immobilization ◽  
Label Free ◽  
Self Assembled Monolayer ◽  
Detection Range ◽  
Linear Detection

Bacterial infections have become a significant challenge in terms of public health, the food industry, and the environment. Therefore, it is necessary to address these challenges by developing a rapid, cost-effective, and easy-to-use biosensor for early diagnosis of bacterial pathogens. Herein, we developed a simple, label-free, and highly sensitive immunosensor based on electrochemical detection using the Au@MoS₂–PANI nanocomposite. The conductivity of the glassy carbon electrode is greatly enhanced using the Au@MoS₂–PANI nanocomposite and a self-assembled monolayer of mercaptopropionic acid on the gold nanoparticle surface was employed for the covalent immobilization of antibodies to minimize the nonspecific adsorption of bacterial pathogens on the electrode surface. The biosensor established a high selectivity and sensitivity with a low limit of detection of 10 CFU/mL, and detected Escherichia coli within 30 min. Moreover, the developed biosensor demonstrated a good linear detection range, practical utility in urine samples, and electrode regenerative studies.

scholarly journals An integrated optic ethanol vapor sensor based on a silicon-on-insulator microring resonator coated with a porous ZnO film

2010 ◽  
Vol 18 (11) ◽  
pp. 11859 ◽  
Author(s):  
Nebiyu A. Yebo ◽  
Petra Lommens ◽  
Zeger Hens ◽  
Roel Baets
Keyword(s):  
Ethanol Vapor ◽  
Microring Resonator ◽  
Silicon On Insulator ◽  
Zno Film ◽  
Vapor Sensor

scholarly journals Silver Enhances Hematite Nanoparticles Based Ethanol Sensor Response and Selectivity at Room Temperature

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 440
Author(s):  
Daniel Garcia-Osorio ◽  
Pilar Hidalgo-Falla ◽  
Henrique E. M. Peres ◽  
Josue M. Gonçalves ◽  
Koiti Araki ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ethanol Vapor ◽  
Oxide Semiconductor ◽  
Charge Carrier Density ◽  
Ethanol Sensor ◽  
Volatile Organic

Gas sensors are fundamental for continuous online monitoring of volatile organic compounds. Gas sensors based on semiconductor materials have demonstrated to be highly competitive, but are generally made of expensive materials and operate at high temperatures, which are drawbacks of these technologies. Herein is described a novel ethanol sensor for room temperature (25 °C) measurements based on hematite (α‑Fe2O3)/silver nanoparticles. The AgNPs were shown to increase the oxide semiconductor charge carrier density, but especially to enhance the ethanol adsorption rate boosting the selectivity and sensitivity, thus allowing quantification of ethanol vapor in 2–35 mg L−1 range with an excellent linear relationship. In addition, the α-Fe2O3/Ag 3.0 wt% nanocomposite is cheap, and easy to make and process, imparting high perspectives for real applications in breath analyzers and/or sensors in food and beverage industries. This work contributes to the advance of gas sensing at ambient temperature as a competitive alternative for quantification of conventional volatile organic compounds.

Extended linear detection range for optical tweezers using a stop at the back focal plane of the condenser

2015 ◽  
Vol 17 (6) ◽  
pp. 065606 ◽  
Author(s):  
S Masoumeh Mousavi ◽  
Akbar Samadi ◽  
Faegheh Hajizadeh ◽  
S Nader S Reihani
Keyword(s):  
Optical Tweezers ◽  
Focal Plane ◽  
Detection Range ◽  
Linear Detection

Flexible cotton-AuNP thread electrode for non-enzymatic sensor of uric acid in urine

2021 ◽  
Author(s):  
Kanyapat Teekayupak ◽  
Nipapan Ruecha ◽  
Orawon Chailapakul ◽  
Nadnudda Rodthongkum
Keyword(s):  
Uric Acid ◽  
Differential Pulse ◽  
Detection Sensitivity ◽  
Cotton Fibers ◽  
Flexible Electrode ◽  
Detection Range ◽  
Sensor Platform ◽  
Linear Detection ◽  
Pulse Voltammetry ◽  
Enzymatic Detection

Abstract We report on the development of an electrochemical sensor platform based on modified cotton fibers for the non-enzymatic detection of uric acid (UA), an important biomarker for gout disease. To create the flexible electrode, a cotton thread was coated with carbon ink followed by the electrodeposition of AuNPs. Then, differential pulse voltammetry (DPV) was used to evaluate the sensor performances, and a linear detection range between 10 µM and 5.0 mM of uric acid was obtained. The sensor has a low detection limit of 0.12 µM, which is optimal for use in the patients suffering from gout disease which commonly experience concentrations of uric acid in urine higher than 4.46 mM. Furthermore, we found that the detection sensitivity of the platform was not affected by the presence of other physiological compounds present in human urine. The described platform has the potential for integration in a diaper hence enabling rapid detection and screening for gout disease.

Behavior of Volatile Organic Liquid Mixtures in the Soil Environment

1998 ◽  
pp. 37-58 ◽  
Author(s):  
B. Yaron ◽  
I. Dror ◽  
E. Graber ◽  
J. Jarsjo ◽  
P. Fine ◽  
...  
Keyword(s):  
Organic Liquid ◽  
Liquid Mixtures ◽  
Soil Environment ◽  
Volatile Organic

scholarly journals Fluorescence Detection of Atmospheric SO2 Using Excitation by NO-γ-Bands

1978 ◽  
Vol 33 (7) ◽  
pp. 782-785 ◽  
Author(s):  
F. Michels ◽  
C. Zetzsch ◽  
F. Stuhl
Keyword(s):  
Fluorescence Detection ◽  
Wavelength Region ◽  
Time Response ◽  
Detection Range ◽  
Linear Detection

A method previously applied for the detection of NO was modified to also monitor SO2. With this method SO2 is excited by NO-γ-bands (A2 Σ+→X2 IIr) and is detected by its subsequent fluorescence in the wavelength region from 300 to 400 nm. The results indicate a linear detection range from 4 ppb to 100 ppm in air using a time response of 100 s. The interferences from some atmospheric constituents were investigated.

Fast and simple glass-based charged particles detector with large linear detection range

2017 ◽  
Vol 12 (07) ◽  
pp. T07008-T07008 ◽  
Author(s):  
D. Beznosko ◽  
R.U. Beisembaev ◽  
E.A. Beisembaeva ◽  
A. Duspayev ◽  
A. Iakovlev ◽  
...  
Keyword(s):  
Charged Particles ◽  
Detection Range ◽  
Linear Detection

Cross sensitivity effects of volatile organic compounds on a SAW-based elemental mercury vapor sensor

2015 ◽  
Vol 212 ◽  
pp. 235-241 ◽  
Author(s):  
K.M. Mohibul Kabir ◽  
Ylias M. Sabri ◽  
Glenn I. Matthews ◽  
Samuel J. Ippolito ◽  
Suresh K. Bhargava
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Elemental Mercury ◽  
Mercury Vapor ◽  
Cross Sensitivity ◽  
Volatile Organic ◽  
Vapor Sensor ◽  
Elemental Mercury Vapor
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