Cost-effective nebulizer sprayed ZnO thin films for enhanced ammonia gas sensing – Effect of deposition temperature

Ravichandran, K.; Manivasaham, A.; Subha, K.; Chandrabose, A.; Mariappan, R.

doi:10.1016/j.surfin.2016.06.004

Cited by 30 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the sample was mounted inside the gas chamber, resistance increases due to the adsorption of oxygen in the chamber. The adsorbed oxygen receives electrons from the conduction band of ZnO creating oxygen ions [26,27]. The maximum resistance attained is called ‘air resistance ( R a )’ (initial resistance or base resistance).…”

Section: Resultsmentioning

confidence: 99%

“…When the ammonia gas was allowed to pass into the chamber, it reacts with the adsorbed oxygen and releases free electrons and thereby reduces the resistance of the film as shown in Figure 13. The gas sensing is related with the surface reaction between the atmospheric oxygen and the applied gas [26]. The resistance of the sample reaches a minimum value called gas resistance ( R g ).…”

Section: Resultsmentioning

confidence: 99%

“…2 ) [26,27]. The maximum resistance attained is called 'air resistance (R a )' (initial resistance or base resistance).…”

Section: Gas-sensing Studiesmentioning

confidence: 99%

“…Among these, spray pyrolysis technique is one of the best chemical methods to deposit high-quality ZnO thin films comparable with some other methods due to its very many advantages such as simplicity, low-cost large area coverage and non-vacuum coating nature [25]. In this work, undoped and Cr-doped samples are prepared using automated jet nebuliser spray pyrolysis (AJNSP) technique [26]. Advantages of AJNSP technique are large area of coating at a time, repeatability to have same character when same process parameters are maintained, different morphological patterns can be obtained by changing the parameters involved in spraying and mainly, and it is risk free during the fabrication of samples.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Light intensity effects on the sensitivity of ZnO: Cr gas sensor

Manivasaham¹,

Ravichandran²,

Subha³

2017

Surface Engineering

Self Cite

View full text Add to dashboard Cite

Chromium-doped zinc oxide thin films (Cr: ZnO) with different Cr concentration were prepared using a homemade nebuliser spray pyrolysis system, and the influence of Cr doping level on the physical properties and the influence of light on the gas-sensing properties of ZnO films were investigated. The XRD results reveal that the hexagonal wurtzite structure of ZnO was not affected by the Cr doping. All the films have average transmittance about 85% in the visible region. The film shows good sensing behaviour against ammonia gas under dark condition than ambient (64 lx) and 150 W (5840 lx) incandescent lights. Of the tested samples, ZnO:Cr film with 2 at.-% of Cr doping shows the best response and recovery time for ammonia gas. The reasons for the enhanced sensing ability of the doped films were explained with the help of FESEM, AFM and optical results.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…2 ) [26,27]. The maximum resistance attained is called 'air resistance (R a )' (initial resistance or base resistance).…”

Section: Gas-sensing Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Light intensity effects on the sensitivity of ZnO: Cr gas sensor

Manivasaham¹,

Ravichandran²,

Subha³

2017

Surface Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…In particular, ZnO, which has a wide bandgap (approximately 3.35 eV) and excellent semiconductor properties, has been widely used in gas sensors [ 17 , 18 ]. However, metal oxide-based sensors generally require high operating temperatures (150–500 °C), limiting their application at room temperature [ 19 , 20 , 21 ]. Reduced graphene oxide (rGO) maintains the characteristics and chemical stability of graphene and increases conductivity via reduction.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Fully Printed Ammonia Gas Sensor Based on ZnO/rGO Using Ultraviolet–Ozone Treatment

Won,

Sim,

et al. 2024

Sensors

View full text Add to dashboard Cite

In this study, a room-temperature ammonia gas sensor using a ZnO and reduced graphene oxide (rGO) composite is developed. The sensor fabrication involved the innovative application of reverse offset and electrostatic spray deposition (ESD) techniques to create a ZnO/rGO sensing platform. The structural and chemical characteristics of the resulting material were comprehensively analyzed using XRD, FT-IR, FESEM, EDS, and XPS, and rGO reduction was achieved via UV–ozone treatment. Electrical properties were assessed through I–V curves, demonstrating enhanced conductivity due to UV–ozone treatment and improved charge mobility from the formation of a ZnO–rGO heterojunction. Exposure to ammonia gas resulted in increased sensor responsiveness, with longer UV–ozone treatment durations yielding superior sensitivity. Furthermore, response and recovery times were measured, with the 10 min UV–ozone-treated sensor displaying optimal responsiveness. Performance evaluation revealed linear responsiveness to ammonia concentration with a high R2 value. The sensor also exhibited exceptional selectivity for ammonia compared to acetone and CO gases, making it a promising candidate for ammonia gas detection. This study shows the outstanding performance and potential applications of the ZnO/rGO-based ammonia gas sensor, promising significant contributions to the field of gas detection.

show abstract