Impedance analysis of CuBr films for ammonia gas detection

Lauque, Pascal; Laugier, J.M.; Jacolin, C.; Bendahan, Marc; Lemire, Céline; Knauth, Philippe

doi:10.1016/s0925-4005(02)00265-4

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…Copper(I) bromide (CuBr) was considered to be a favorable ammonia (NH 3 ) gas sensing material because of the strong interaction between copper(I) ions (Cu + ) and NH 3 gas molecules. − This could be a basis for the development of a NH 3 gas sensor in comparison to usual, especially metal oxide semiconductor devices . However, the NH 3 gas sensing mechanism of CuBr remained unclear because of the its inherent characteristic of mixed ionic−electronic conducting.…”

Section: Introductionmentioning

confidence: 99%

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

Zhang

et al. 2011

J. Phys. Chem. C

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Copper(I) bromide (CuBr) was considered to be a good gas sensing material with a high sensitivity and selectivity to ammonia (NH3) at ambient temperature. The NH3 sensing mechanism was generally considered to be a result of the strong interaction between NH3 molecules and Cu+ ions. When CuBr-coated quartz-crystal microbalance (QCM), a typical gravimetric transducer, was exposed to NH3, the device displayed a decrease rather than an increase in total mass. This was an unusual phenomenon. In situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) was employed to examine the reasons of this total mass decrease. Probing of species formed on the CuBr surface revealed that a complex form between the Cu+ ions and the O2 molecules in air existed. Consequently, O2 gas with a higher molecular weight than NH3 was substituted by NH3 gas, inducing the decrease in mass. The band at 1123 cm−1 of the DRIFT spectrum of CuBr corresponding to the complex formed between O2 molecules and Cu+ ions was identified. The intensity of this band which decreased with the formation of NH3 complex was also observed. The observation was a result of the substitution process for O2 adsorption instead of NH3.

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Section: Introductionmentioning

confidence: 99%

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

Zhang

et al. 2011

J. Phys. Chem. C

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“…Common examples include chemical resistors (typically referred to as chemiresistors) [22][23][24][25][26][27][28][29], chemically sensitive field-effect transistors (chemFETs) [30,31], electrochemical sensors [32][33][34][35][36][37][38][39][40][41][42], semiconducting metal oxide (SMO) sensors [43][44][45][46][47][48][49], and thermal sensors [50][51][52][53][54]. The detection mechanism varies across this class of sensors from a swelling-induced change in the conductance of polymer-based chemiresistors, to the calorimetricinduced change in conductance of thermal sensors.…”

Section: Conductance-based Sensorsmentioning

confidence: 99%

An assessment of sensing technologies for the detection of clandestine methamphetamine drug laboratories

Man

Stoeber

Walus

2009

Forensic Science International

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“…Copper(I) bromide (CuBr) is a room-temperature Cu + ion conductor with a conductivity of 3 × 10 –8 S/cm. , The Cu + can react with NH 3 to form Cu(NH 3 ) 2 + , which immobilizes the copper(I) ions and decreases the electrical conductivity. , For wearable sensor applications, sensitive, selective, rapid, and reversible detection of NH 3 using a flexible sensor structure at room temperature is essential. The humidity-independent NH 3 sensing characteristics are also mandatory because ambient humidity changes dynamically according to the variation of location, season, day and night, and weather.…”

Section: Introductionmentioning

confidence: 99%

Flexible Room-Temperature NH₃ Sensor for Ultrasensitive, Selective, and Humidity-Independent Gas Detection

Lee

Kim

et al. 2018

ACS Appl. Mater. Interfaces

222

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Ammonia (NH) is an irritant gas with a unique pungent odor; sub-parts per million-level breath ammonia is a medical biomarker for kidney disorders and Helicobacter pylori bacteria-induced stomach infections. The humidity varies in both ambient environment and exhaled breath, and thus humidity dependence of gas-sensing characteristics is a great obstacle for real-time applications. Herein, flexible, humidity-independent, and room-temperature ammonia sensors are fabricated by the thermal evaporation of CuBr on a polyimide substrate and subsequent coating of a nanoscale moisture-blocking CeO overlayer by electron-beam evaporation. CuBr sensors coated with a 100 nm-thick CeO overlayer exhibits an ultrahigh response (resistance ratio) of 68 toward 5 ppm ammonia with excellent gas selectivity, rapid response, reversibility, and humidity-independent sensing characteristics at room temperature. In addition, the sensing performance remains stable after repetitive bending and long-term operation. Moreover, the sensors exhibit significant response to the simulated exhaled breath of patients with H. pylori infection; the simulated breath contains 50 ppb NH. The sensors thus show promising potential in detecting sub-parts per million-level NH, regardless of humidity fluctuations, which can open up new applications in wearable devices for in situ medical diagnosis and indoor/outdoor environment monitoring.

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Impedance analysis of CuBr films for ammonia gas detection

Cited by 11 publications

References 16 publications

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

An assessment of sensing technologies for the detection of clandestine methamphetamine drug laboratories

Flexible Room-Temperature NH₃ Sensor for Ultrasensitive, Selective, and Humidity-Independent Gas Detection

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Impedance analysis of CuBr films for ammonia gas detection

Cited by 11 publications

References 16 publications

NH3 Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu+ Ion with NH3 and O2 Molecules

NH3 Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu+ Ion with NH3 and O2 Molecules

An assessment of sensing technologies for the detection of clandestine methamphetamine drug laboratories

Flexible Room-Temperature NH3 Sensor for Ultrasensitive, Selective, and Humidity-Independent Gas Detection

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NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

Flexible Room-Temperature NH₃ Sensor for Ultrasensitive, Selective, and Humidity-Independent Gas Detection