Metal oxide nanowires for chemiresistive gas sensors: Issues, challenges and prospects

Ramgir, Niranjan S.; Datta, Niyanta; Kaur, Manmeet; Kailasaganapathi, S.; Debnath, A.K.; Aswal, D. K.; Gupta, S. K.

doi:10.1016/j.colsurfa.2013.02.029

Cited by 152 publications

(109 citation statements)

References 180 publications

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“…The nanoparticles of transition metals are an important class of semiconductors, which have expressed significant advances owing to wide range of applications in the field of electronics, sensors, automobiles, nano-fabrics, bio-medical, agriculture, bio-engineering, medicines, and other areas (Ramgir et al, 2013). A wide range of copper nanoparticles can be produced using chemical methods and physical methods.…”

Section: Issn: 2319-7706 Volume 7 Number 04 (2018)mentioning

confidence: 99%

Green Synthesis of Copper Nano-Particles Using Asparagus adscendens Roxb. Root and Leaf Extract and Their Antimicrobial Activities

Thakur¹,

Sharma²,

Thakur³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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Section: Issn: 2319-7706 Volume 7 Number 04 (2018)mentioning

confidence: 99%

Green Synthesis of Copper Nano-Particles Using Asparagus adscendens Roxb. Root and Leaf Extract and Their Antimicrobial Activities

Thakur¹,

Sharma²,

Thakur³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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“…Despite the large number of potential applications and useful properties, the well-controlled preparation of NO films with the reproducible behavior remains a challenge. This is partly due to 40 the existence of at least three stable NO's each having different electrical properties ranging from conducting NbO through semiconducting NbO 2 to insulating Nb 2 O 5 . 9 Additionally, in the Nb-O system there exist numerous metastable oxides NbO x with 0 < x < 1 and 2.0 < x < 2.5 as well as a multitude of Nb 2 O 5 45 polymorphic modifications.…”

Section: Introductionmentioning

confidence: 99%

“…High-temperature annealing of the films helps achieve well-controlled crystallization and phase transition effects. The 35 morphology-structure-property relationship for the synthesized NO nanostructures is determined by means of field-emission scanning (SEM) and transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), time of flight secondary ion mass spectrometry (ToF-SIMS), X-ray diffraction (XRD), 40 and energy dispersive X-ray (EDX) point analysis. A model of nucleation and growth of the NO nanocolumn arrays is proposed and experimentally justified.…”

Section: Introductionmentioning

confidence: 99%

“…The instrumental contribution was obtained from a sample of LaB 6 (SRM 660a) analyzed under the same conditions and was considered prior to estimation of the crystallite size. 40 EIS measurements were carried out in 0.5 mol dm -3 H 3 BO 3 /0.05 mol dm -3 Na 2 B 4 O 7 solution (pH 7.4) at 296 K. A µAutolab III/FRA2 Metrohm Autolab Potentiostats/Galvanostats was used as the impedance analyzer linked to PC via a USB cable. The signal amplitude was 140 mV over the frequency range of 45 10 mHz -800 kHz.…”

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confidence: 99%

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Formation–structure–properties of niobium-oxide nanocolumn arrays via self-organized anodization of sputter-deposited aluminum-on-niobium layers

et al. 2014

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Nanostructured niobium oxide (NO) semiconductor is gaining increasing attention as electronic, optical, and electro-optic material. However, the preparation of stable NO nanofilms with reproducible morphology and behavior remains a challenge. 10Here we show a rapid, well-controlled, and efficient way to synthesize NO films with the self-organized columnlike nanostructured morphologies and advanced functional properties. The films are developed via the growth of a nanoporous anodic alumina layer, followed by the pore-directed 15 anodizing of the Nb underlayer. The columns may grow 30-150 nm wide, up to 900 nm long, with the aspect ratio up to 20, being anchored to a thin continuous oxide layer that separates the columns from the substrate. The as anodized films have a graded chemical composition changing from amorphous Nb 2 O 5 mixed with Al 2 O 3 , Si-, and P-containing species in the surface region to NbO 2 in the lower film layer. The post-anodizing treatments result in the controlled 20 formation of Nb 2 O 5 , NbO 2 , and NbO crystal phases, accompanied by transformation from nearly perfect dielectric to n-type semiconductor behavior of the films. The approach allows for the smooth film growth without early dielectric breakdown, stress-generated defects, or destructive dissolution at the respective interfaces, which is a unique situation in the oxide films on niobium. The functional properties of the NO films, revealed to date, allow for potential applications as nanocomposite capacitor dielectrics and active 25 layers for semiconductor gas microsensors with the sensitivity to ethanol and the response to hydrogen being among best ever reported.

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“…A small grain size down to nanocrystals [18] also improves the sensitivity as the bulk conductance of the material is not affected by gas adsorbed on the grain surface. Recently, nanostructured sensors based on nanowires [19] have been proposed and sometimes postulated as being necessary for achieving very low detection limits due to the high surface area achieved. Especially carbon nanotube-based sensors have been extensively studied with the expectation that these provide the key for very high sensitivity [20][21][22].…”

Section: Highly Sensitive Semiconductor Gas Sensor Principlesmentioning

confidence: 99%

Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to?

et al. 2017

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Abstract:Monitoring of volatile organic compounds (VOCs) is of increasing importance in many application fields such as environmental monitoring, indoor air quality, industrial safety, fire detection, and health applications. The challenges in all of these applications are the wide variety and low concentrations of target molecules combined with the complex matrix containing many inorganic and organic interferents. This paper will give an overview over the application fields and address the requirements, pitfalls, and possible solutions for using low-cost sensor systems for VOC monitoring. The focus lies on highly sensitive metal oxide semiconductor gas sensors, which show very high sensitivity, but normally lack selectivity required for targeting relevant VOC monitoring applications. In addition to providing an overview of methods to increase the selectivity, especially virtual multisensors achieved with dynamic operation, and boost the sensitivity further via novel pro-concentrator concepts, we will also address the requirement for high-performance gas test systems, advanced solutions for operating and read-out electronic, and, finally, a cost-efficient factory and on-site calibration. The various methods will be primarily discussed in the context of requirements for monitoring of indoor air quality, but can equally be applied for environmental monitoring and other fields.

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Metal oxide nanowires for chemiresistive gas sensors: Issues, challenges and prospects

Cited by 152 publications

References 180 publications

Green Synthesis of Copper Nano-Particles Using Asparagus adscendens Roxb. Root and Leaf Extract and Their Antimicrobial Activities

Green Synthesis of Copper Nano-Particles Using Asparagus adscendens Roxb. Root and Leaf Extract and Their Antimicrobial Activities

Formation–structure–properties of niobium-oxide nanocolumn arrays via self-organized anodization of sputter-deposited aluminum-on-niobium layers

Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to?

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