Cd doped ZnO nanorods for efficient room temperature NH3 sensing

Brahma, Sanjaya; Huang, Po-Yuan; Mwakikunga, Bonex W; Saasa, Valentine; Akande, Amos Adeleke; Huang, Jow‐Lay; Liu, Chuan Pu

doi:10.1016/j.matchemphys.2022.127053

Cited by 16 publications

(9 citation statements)

References 28 publications

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“…60 2023) reported that cd-doped ZnO nanorods detected 60 ppm of NH 3 at varied temperatures between 25 and 100 °C. 67 The present investigations produced better findings than previous studies, finding a lower concentration of 2 ppm NH 3 at room temperature with a response time of 21 s and a recovery time of 20 s.…”

Section: Gas Sensing Studiescontrasting

confidence: 63%

Synthesis and Characterization of Flower-Like Cobalt-Doped ZnO Nanostructures for Ammonia Sensing Applications

Himabindu,

Latha Devi,

Nagaraju

et al. 2024

ECS J. Solid State Sci. Technol.

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The present study uses the co-precipitation method to explore the synthesis of zinc oxide and cobalt-doped ZnO sensors, encompassing a range of cobalt concentrations from 1 to 4 wt.%. The synthesized samples undergo comprehensive analysis to evaluate their structural, morphological, optical, and gas-sensing properties. X-ray diffraction revealed a hexagonal Wurtzite structure, and the crystallite size decreased from 16.92 to 15.39 nm. Energy-dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy collectively affirmed the presence of cobalt. Scanning electron microscopy was used to analyze the morphological characteristics. The Tauc-plot was used to determine the optical bandgap via diffuse reflectance spectroscopy. As cobalt doping increased, the band gap increased from 3.18 to 3.23 eV. Further, atomic force microscopy and Brunauer-Emmett-Teller analysis were used to assess the surface topography and pore size distribution. The AFM measurements indicated roughness within 435-700 nm. The BET analysis revealed mesoporous properties, with surface area ranging between 18.657 to 21.962 m2/g. Subsequently, the gas-sensing capabilities of the Co-doped ZnO sensors were examined for various volatile organic compounds at room temperature. The sensor with 4% Cobalt doping exhibited a fast response and recovery time of 21 and 20 seconds for 2 ppm of NH3

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Section: Gas Sensing Studiescontrasting

confidence: 63%

Synthesis and Characterization of Flower-Like Cobalt-Doped ZnO Nanostructures for Ammonia Sensing Applications

Himabindu,

Latha Devi,

Nagaraju

et al. 2024

ECS J. Solid State Sci. Technol.

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“…Generally O 2 − is created at RT (<100 °C) and O − and O 2− are produced at higher temperature (>100 °C) as shown in eqn (3)–(5). 27 O 2 (ads) + e − → O 2 − (ads)O 2 − (ads) + 2e − → 2O − (ads)2O − (ads) + e − → O 2− (ads)…”

Section: Resultsmentioning

confidence: 99%

A room-temperature gas sensor based on 2D Ni–Co–Zn ternary oxide nanoflakes for selective and sensitive ammonia detection

Karmakar,

Sett,

Maity

et al. 2023

Dalton Trans.

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“…15 Besides, the ammonia gas sensor based on SnO 2 nanostructures fabricated by Beniwal and his team presented a response of 92% toward 500 ppm at ambient temperature and response/recovery times of 29/49 s. 16 To develop ammonia gas sensor-based ZnO material with higher performances, numerous ways are utilized such as (i) applying an electrostatic eld, (ii) using ultraviolet radiations in sensing operation, and (iii) doping materials using suitable metals. [17][18][19][20][21][22][23] In this study, we selected calcium as a dopant of ZnO to improve the sensing properties of ammonia gas. Calcium is cheap and non-toxic to human health contrary to other elements.…”

Section: Introductionmentioning

confidence: 99%