Highly sensitive and selective room temperature NH3 gas microsensor using an ionic conductor (CuBr) film

Lauque, Pascal; Bendahan, Marc; Seguin, Jean-Luc; Ngo, Kieu; Knauth, Philippe

doi:10.1016/j.aca.2004.03.071

Cited by 32 publications

(16 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most promising as a solid‐state and low‐cost sensor material is CuBr featuring high selectivity and sensitivity to low NH 3 concentrations (e.g., 20 ppb14) also at room temperature 15. The CuBr is an ionic conductor with Cu + as charge carrier.…”

Section: Introductionmentioning

confidence: 99%

“…Thin CuBr films have been fabricated by radio frequency sputtering of CuBr,16 liquid‐phase bromination of Cu films in solutions17 and direct evaporation and condensation of CuBr where also CeO 2 overlayers were prepared to mitigate humidity interference 14. However, these methods usually result in micron‐sized CuBr particles14 and rather dense film morphologies15,17 that could impede efficient NH 3 diffusion in the film and interaction with the CuBr surface.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rapid and Selective NH₃ Sensing by Porous CuBr

et al. 2020

View full text Add to dashboard Cite

Fast and selective detection of NH3 at parts‐per‐billion (ppb) concentrations with inexpensive and low‐power sensors represents a long‐standing challenge. Here, a room temperature, solid‐state sensor is presented consisting of nanostructured porous (78%) CuBr films. These are prepared by flame‐aerosol deposition of CuO onto sensor substrates followed by dry reduction and bromination. Each step is monitored in situ through the film resistance affording excellent process control. Such porous CuBr films feature an order of magnitude higher NH3 sensitivity and five times faster response times than conventional denser CuBr films. That way, rapid (within 2.2 min) sensing of even the lowest (e.g., 5 ppb) NH3 concentrations at 90% relative humidity is attained with outstanding selectivity (30–260) over typical confounders including ethanol, acetone, H2, CH4, isoprene, acetic acid, formaldehyde, methanol, and CO, superior to state‐of‐the‐art sensors. This sensor is ideal for hand‐held and battery‐driven devices or integration into wearable electronics as it does not require heating. From a broader perspective, the process opens exciting new avenues to also explore other bromides and classes of semiconductors (e.g., sulfides, nitrides, carbides) currently not accessible by flame‐aerosol technology.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid and Selective NH₃ Sensing by Porous CuBr

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The lowest detectable limit, 2 ppm of ammonia shown by this compound is lower than that shown by fibre optic sensor 7 and comparable to CuBr based sensor. 5 It is also pointed out that the response times are much shorter than the CuBr based sensor. 5 (Fig.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Ammonia sensing properties of thick and thin films of Ag₆Mo₁₀O₃₃ and Cr_1·8Ti_0·2O_3+δ

Prabhu

Muthuraja

Gnanasekar

et al. 2008

Surface Engineering

View full text Add to dashboard Cite

Thick film of silver decamolybdate (Ag6Mo10O33) was screen printed and thin film of chromium titanate Cr1·8Ti0·2O3+ δ was laser deposited on alumina substrates. Morphological features of the films were characterised and ammonia sensing properties were studied. Resistance of Ag6Mo10O33 thick films decrease on introduction of NH3 gas and these films were capable of sensing 2 ppm of ammonia in air at 578 K. Cr1·8Ti0·2O3+ δ thin films could sense 20 ppm of ammonia in air at 673 K, which exhibited increase in resistance towards NH3 gas.

show abstract

“…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. Although earlier studies have ever demonstrated the possibility of CuBr as ammonia-sensing materials, − the studies neither investigated the humidity dependence of gas-sensing behaviors , nor achieved the humidity-independent gas-sensing characteristics. , Moreover, no flexible CuBr-based ammonia sensor was reported. For medical diagnosis, trace concentrations of NH 3 in exhaled breath should be measured in highly humid atmospheres (>80% relative humidity (RH)), and the humidity-independent ammonia sensor can simplify the sensor system significantly because the preconditioning of exhaled gas through the dehumification process can be neglected .…”

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

224

View full text Add to dashboard Cite

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.

show abstract

Highly sensitive and selective room temperature NH3 gas microsensor using an ionic conductor (CuBr) film

Cited by 32 publications

References 11 publications

Rapid and Selective NH₃ Sensing by Porous CuBr

Rapid and Selective NH₃ Sensing by Porous CuBr

Ammonia sensing properties of thick and thin films of Ag₆Mo₁₀O₃₃ and Cr_1·8Ti_0·2O_3+δ

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

Contact Info

Product

Resources

About

Highly sensitive and selective room temperature NH3 gas microsensor using an ionic conductor (CuBr) film

Cited by 32 publications

References 11 publications

Rapid and Selective NH3 Sensing by Porous CuBr

Rapid and Selective NH3 Sensing by Porous CuBr

Ammonia sensing properties of thick and thin films of Ag6Mo10O33 and Cr1·8Ti0·2O3+δ

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

Contact Info

Product

Resources

About

Rapid and Selective NH₃ Sensing by Porous CuBr

Rapid and Selective NH₃ Sensing by Porous CuBr

Ammonia sensing properties of thick and thin films of Ag₆Mo₁₀O₃₃ and Cr_1·8Ti_0·2O_3+δ

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