Gas Sensing Properties of Metal-decorated Tungsten Oxide Nanowires Directly Grown onto Flexible Polymeric Hotplates

Annanouch, Fatima Ezahra; Camara, M.; Ramírez, José Luis; Briand, D.; Llobet, Eduard

doi:10.1016/j.proeng.2014.11.633

Cited by 6 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A film consists of high density wire-like structures. SEM images show the presence of randomly oriented nanoneedles, which is in good agreement with our previously reported results [16,23,24].…”

Section: Resultssupporting

confidence: 92%

“…Morphological characterization of the sensing films Electron scanning microscopy: The cristalline order of pure and Au-decorated tungsten oxide nanoneedles grown by AACVD was studied in previous works [23,24,28]. Figure 1 shows the film morphology observed by SEM for pure and Au-decorated tungsten oxide nanoneedles grown by AACVD.…”

Section: Resultsmentioning

confidence: 99%

“…The deposition time ranged between 40 to 50 minutes, until all the precursor passed through the reactor chamber [22,23]. After deposition, an annealing step of the films was carried in an oven at 500ºC for 3 h under a constant 200 ml/min flow of dry air [24]. After that, the substrates mounted to a PCB support using platinum wires and a silver soldering paste.…”

Section: Sensor Substrate and Aacvd Depositionmentioning

confidence: 99%

See 2 more Smart Citations

Methanol, Ethanol and Acetone Sensing Using AACVD-grown Tungsten Oxide Nanoneedles

Thamri¹,

Baccar²,

Fe³

et al. 2016

J Nanomed Nanotechnol

View full text Add to dashboard Cite

We report on the aerosol assisted chemical vapor deposition growth of either pure or gold-nanoparticle decorated tungsten oxide nanoneedles, directly integrated onto alumina transducers for achieving resistive gas sensors. The morphology of the different samples grown is studied by scanning electron microscopy and by atomic force microscopy. The performance of these nanomaterials for the detection of methanol, ethanol and acetone vapors at ppm levels is studied. It is found that the detection of these species is possible even in a background of nitrogen where oxygen is present at ppm levels only. The presence of Au nanoparticles on the surface of tungsten oxide nanoneedles significantly increases sensitivity towards the vapors considered. Additionally, Au loading enhances the kinetics of surface reactions and helps decreasing response time. The detection mechanism and the role of Au nanoparticles is discussed in light of the experimental findings.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Sensor Substrate and Aacvd Depositionmentioning

confidence: 99%

See 1 more Smart Citation

Methanol, Ethanol and Acetone Sensing Using AACVD-grown Tungsten Oxide Nanoneedles

Thamri¹,

Baccar²,

Fe³

et al. 2016

J Nanomed Nanotechnol

View full text Add to dashboard Cite

show abstract

“…Recently, we have shown that aerosol-assisted chemical vapor deposition (AACVD) is a suitable method for growing, in a single step, WO 3 nanoneedles decorated with metal nanoparticles. ,,, Unlike in conventional CVD, where precursors must be volatile and thermally stable, AACVD allows for the use of a wide range of precursors owing to its solution-delivery-based principle . Furthermore, the AACVD process is conducted at lower temperatures than CVD, typically in a range between 350 and 600 °C, which makes it suitable for the direct, bottom-up integration of gas-sensitive nanomaterials onto a wide spectrum of substrates including glass, ceramic, silicon micro/electromechanical systems (MEMSs), or even flexible polymeric . In this paper, we report, for the first time, on the direct growth of WO 3 nanoneedles decorated with p-type Cu 2 O nanoparticles onto MEMS hot plates in a single step by using AACVD.…”

Section: Introductionmentioning

confidence: 99%

“…12 Furthermore, the AACVD process is conducted at lower temperatures than CVD, typically in a range between 350 and 600 °C, which makes it suitable for the direct, bottom-up integration of gas-sensitive nanomaterials onto a wide spectrum of substrates including glass, ceramic, silicon micro/electromechanical systems (MEMSs), or even flexible polymeric. 33 In this paper, we report, for the first time, on the direct growth of WO 3 nanoneedles decorated with ptype Cu 2 O nanoparticles onto MEMS hot plates in a single step by using AACVD. To the best of our knowledge, CVD routes have not been used before to grow WO 3 nanoneedles and simultaneously decorate them with nanoparticles of copper oxides, all in a single step and avoiding a further oxidation step.…”

Section: ■ Introductionmentioning

confidence: 99%

Aerosol-Assisted CVD-Grown WO₃ Nanoneedles Decorated with Copper Oxide Nanoparticles for the Selective and Humidity-Resilient Detection of H₂S

Annanouch

Haddi

Vallejos

et al. 2015

ACS Appl. Mater. Interfaces

163

View full text Add to dashboard Cite

A gas-sensitive hybrid material consisting of Cu2O nanoparticle-decorated WO3 nanoneedles is successfully grown for the first time in a single step via aerosol-assisted chemical vapor deposition. Morphological, structural, and composition analyses show that our method is effective for growing single-crystalline, n-type WO3 nanoneedles decorated with p-type Cu2O nanoparticles at moderate temperatures (i.e., 380 °C), with cost effectiveness and short fabrication times, directly onto microhot plate transducer arrays with the view of obtaining gas sensors. The gas-sensing studies performed show that this hybrid nanomaterial has excellent sensitivity and selectivity to hydrogen sulfide (7-fold increase in response compared with that of pristine WO3 nanoneedles) and a low detection limit (below 300 ppb of H2S), together with unprecedented fast response times (2 s) and high immunity to changes in the background humidity. These superior properties arise because of the multiple p-n heterojunctions created at the nanoscale in our hybrid nanomaterial.

show abstract

Influence of surface defects and preferential orientation in nanostructured Ce-doped SnO2 thin films by nebulizer spray deposition for lowering the LPG sensing temperature to 150 °C

Thomas¹,

Deepa²,

Kumari³

2018

Ionics

View full text Add to dashboard Cite

Gas Sensing Properties of Metal-decorated Tungsten Oxide Nanowires Directly Grown onto Flexible Polymeric Hotplates

Cited by 6 publications

References 4 publications

Methanol, Ethanol and Acetone Sensing Using AACVD-grown Tungsten Oxide Nanoneedles

Methanol, Ethanol and Acetone Sensing Using AACVD-grown Tungsten Oxide Nanoneedles

Aerosol-Assisted CVD-Grown WO₃ Nanoneedles Decorated with Copper Oxide Nanoparticles for the Selective and Humidity-Resilient Detection of H₂S

Influence of surface defects and preferential orientation in nanostructured Ce-doped SnO2 thin films by nebulizer spray deposition for lowering the LPG sensing temperature to 150 °C

Contact Info

Product

Resources

About

Gas Sensing Properties of Metal-decorated Tungsten Oxide Nanowires Directly Grown onto Flexible Polymeric Hotplates

Cited by 6 publications

References 4 publications

Methanol, Ethanol and Acetone Sensing Using AACVD-grown Tungsten Oxide Nanoneedles

Methanol, Ethanol and Acetone Sensing Using AACVD-grown Tungsten Oxide Nanoneedles

Aerosol-Assisted CVD-Grown WO3 Nanoneedles Decorated with Copper Oxide Nanoparticles for the Selective and Humidity-Resilient Detection of H2S

Influence of surface defects and preferential orientation in nanostructured Ce-doped SnO2 thin films by nebulizer spray deposition for lowering the LPG sensing temperature to 150 °C

Contact Info

Product

Resources

About

Aerosol-Assisted CVD-Grown WO₃ Nanoneedles Decorated with Copper Oxide Nanoparticles for the Selective and Humidity-Resilient Detection of H₂S