A novel highly sensitive gas ionization sensor for ammonia detection

Huang, Jiarui; Wang, Junhai; Gu, Cuiping; Yu, Kun; Meng, Fanli; Liu, Jinhuai

doi:10.1016/j.sna.2009.01.008

Cited by 75 publications

(58 citation statements)

References 16 publications

(16 reference statements)

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“…The absorbed NH 3 molecules donate electrons to CNTs and form a space charge region on the surface of a p-type CNT semiconductor, thereby decreasing the number of holes and reducing the effective area for charge transfer. 15,16) Consequently, the resistance of the CNT layer increases.…”

Section: Resultsmentioning

confidence: 99%

Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH<sub>3</sub> Gas Sensitivity at Room Temperature

et al. 2015

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Multi-walled carbon nanotubes (CNTs) were directly grown on alumina substrates patterned with Pt interdigitated electrodes by chemical vapor deposition method to fabricate gas sensor. Pt and Ag thin layers with nominal thicknesses of 2 and 4 nm were coated on the CNT layer by evaporation method to modify the CNT properties. The gas sensing results showed that the CNT/Pt-and CNT/Ag-based sensors exhibited enhanced sensitivity to NH 3 gas at room temperature. The responses of the CNT/Pt (3.0%) and CNT/Ag (6.9%) sensors with a 4 nm thick metallic layer to 70 ppm NH 3 were higher than that of pristine CNT sensor (1.5%).

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Section: Resultsmentioning

confidence: 99%

Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH<sub>3</sub> Gas Sensitivity at Room Temperature

et al. 2015

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“…More specifically, the effects of the central metal atom on gas sensor performance were measured electrically (resistivity changes were monitored) for thin films of tetra-(tert- Co, Pt, Pd [59]. It was shown that the sensor response varied in the following order: Pd > Ni > Co in the case of MTAP(t-Bu) 4 [60]; and Cu > Pb > Ni in the case of MPc(iso-PeO) 4 , respectively [61]. This order has been rationalized in terms of the central ion size: the larger ion radius is, the more d-electrons participate in binding with ammonia.…”

Section: Comparison With Similar Metal Phthalocyaninesmentioning

confidence: 99%

“…Therefore, monitoring of ammonia in the gas phase is a very urgent problem in various applications, from industrial hygiene and environmental protection in chemical industry to clinical diagnostics, etc. [2] So far a huge variety of chemical sensors of ammonia have been proposed, including those based on inorganic, inorganic oxide/dioxide, and conducting polymers [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Thin films of fluorinated 3d-metal phthalocyanines as chemical sensors of ammonia: An optical spectroscopy study

Basova

Mikhaleva

Hassan

et al. 2016

Sensors and Actuators B: Chemical

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Highlights-The sensor response of fluorinated metal phthalocyanines toward NH 3 was performed.-The sensor response was studied using surface plasmon resonance technique.-The effect of central metal in MPcF 16 molecule to the sensor response was verified.-The structure of analyte/phthalocyanine complex was analysed using DFT calculations.3 A comparative study of the sensor response toward gaseous ammonia of hexadecafluorinated 3d-metal phthalocyanine (MPcF 16 , M=Cu(II), Co(II), Zn(II), Ni(II)) thin films was performed using complementary experimental (viz., surface plasmon resonance, SPR, and IR absorption spectroscopy) along with theoretical (density functional theory calculations, DFT) techniques. SPR measurements revealed changes of both thickness and optical parameters (refraction indices and extinction coefficients) of the MPcF 16 films caused by adsorption of NH 3 . The MPcF 16 species studied exhibited the following order of sensor response: ZnPcF 16 > CoPcF 16  CuPcF 16 > NiPcF 16 . A good correlation was found between the DFT calculated (B3LYP/6-311++G(2df,p)) binding energies, experimentally measured shift of the selected IR bands, and the optical sensor response. Apart from this, we performed a detailed assignment of all intense bands in the vibrational spectra (IR and Raman) of fluorinated 3d-metal phthalocyanines studied.

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“…The ionization theory was applied in this research since it will result in better selectivity due to the fact that each gas has a unique breakdown voltage which can be used as a fingerprint to identify that gas and ionization-based sensors work by fingerprinting the ionization characteristics of distinct gases and monitoring the breakdown voltage value of each gas [9][10][11][12].…”

Section: Resultsmentioning

confidence: 99%