Nanostructured copper oxides as ethanol vapour sensors

Zoolfakar, Ahmad Sabirin; Ahmad, Muhammad Zamharir; Rani, Rozina Abdul; Ou, Jian Zhen; Balendhran, Sivacarendran; Zhuiykov, Serge; Latham, Kay; Włodarski, W.; Kalantar‐zadeh, Kourosh

doi:10.1016/j.snb.2013.05.042

Cited by 124 publications

(64 citation statements)

References 59 publications

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“…3f and Supporting Information SI-6). Such fast response and recovery times of samples annealed at 425 °C are considerably improved compared to the most results reported on CuO and other p-type semiconductor oxide based sensors [5,6,8,15] and are comparable with most of the ultra-fast n-type semiconductor based sensors which are operated at much higher temperatures (≈400 °C) [25,26]. The dependence of response and recovery times to 100 ppm of EtOH vapour versus operating temperature for sensors based on CuO NW networks (annealed at 425 °C) is presented in Supporting Information SI-7.…”

Section: Resultsmentioning

confidence: 76%

“…The high performances of nanodevices cannot be explained only by their small diameter, and as result of the high surface-to-volume ratio of the CuO NW. The TEM experiments revealed planar defects that could contribute to the sensing properties by enhancing oxygen molecule adsorptions and by an enlargement of the width of hole accumulation layers, which lead to an increase in gas response [8,28,30]. However, this does not explain the fast response and recovery times of a single nanowire nanosensor, which supports the need for extended investigations and will be proposed in a following work.…”

Section: Rapid Research Lettermentioning

confidence: 90%

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Single and networked CuO nanowires for highly sensitive p-type semiconductor gas sensor applications

Lupan

Postica

Creţu

et al. 2015

Phys. Status Solidi RRL

102

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Development of high‐performance p‐type semiconductor based gas sensors exhibiting fast‐response/recovery times with ultra‐high response are of major importance for gas sensing applications. Recent reports demonstrated the excellent properties of p‐type semiconducting oxide for various practical applications, especially for selective oxidation of volatile organic compounds (VOCs). In this work, sensors based on CuO nanowire (NW) networks have been successfully fabricated via a simple thermal oxidation process on pre‐patterned Au/Cr pads. Our investigation demonstrates high impact of the process temperature on aspect ratio and density of copper oxide NWs. An optimal temperature for growth of thin and densely packed NWs was found to be at 425 °C. The fabricated sensors demonstrated ultra‐high gas response by a factor of 313 to ethanol vapour (100 ppm) at an operating temperature of 250 °C. High stability and repeatability of these sensors indicate the efficiency of p‐type oxide based gas sensors for selective detection of VOCs. A high‐performance nanodevice was fabricated in a FIB‐SEM system using a single CuO NW, demonstrating an ethanol response of 202 and rapid response and recovery of ∼198 ms at room temperature. The involved gas sensing mechanism of CuO NW networks has been described. We consider that the presented results will be of a great interest for the development of higher‐performance p‐type semiconductor based sensors and bottom‐up nanotechnologies. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

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Section: Resultsmentioning

confidence: 76%

Section: Rapid Research Lettermentioning

confidence: 90%

Single and networked CuO nanowires for highly sensitive p-type semiconductor gas sensor applications

Lupan

Postica

Creţu

et al. 2015

Phys. Status Solidi RRL

102

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“…These include solar cells [3], gas and chemical sensors [4][5][6][7], nanofluidics [8], photocatalysis [9][10], superhydrophobic surfaces [11], antimicrobial and antifungal agents [12][13] and electrochemical energy storage applications [14][15][16][17][18][19]. In particular, CuO superhydrophobic surfaces have been gaining interest because they have superior hydrophobicity but are very economical.…”

Section: Introductionmentioning

confidence: 99%

Formation of Hierarchical CuO Nanostructures on Copper Foil by Chemical Bath Deposition for Applications in Superhydrophobic Surfaces

Felizco

Magdaluyo

2016

MATEC Web of Conferences

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Abstract. Hierarchical CuO nanostructures (urchin-like and grassy island structure) were successfully synthesized by a simple chemical bath deposition method at low temperature of 70°C in a short reaction time of 1h. XRD analysis revealed the presence of pure crystalline monoclinic CuO. Morphological analysis revealed the formation of spherical structures composed of numerous hair-like structures. The pH of the solution was also investigated to have a great effect on the morphology of the CuO nanostructures. At lower pH, the structures tend to form urchin-like structures; while at higher pH, the structures tend to form grass-like islands. A growth mechanism was also proposed in this paper. Lastly, wettability test proved the stable superhydrophobic property of the CuO nanostructured thin film surface.

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“…Among those techniques, RF magnetron sputtering is a potential method to deposition of copper oxide thin film with high deposition rates and uniformity [10]. In addition, RF magnetron sputtering techniques is good in repeatability performance [11]. In sputtering deposition, the characteristic of the deposited thin film are influenced by the deposition parameter such as oxygen flow ratio, sputtering power, working pressure, deposition time and substrate bias voltage.…”

Section: Introductionmentioning

confidence: 99%

Influence of Oxygen Flow Rate on Sputter Deposition Rate and SEM Image of Copper Oxide Thin Films

Nayan

Low

Sahdan

et al. 2015

AMM

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Abstract. Recently, copper oxide thin film has been studied because of its low cost, sensitivity to ambient condition and easiness to produce oxide thin film. It is one of the p-type semiconductor oxides materials that are suitable to be used as gas sensing material. In order to improve the sensitivity and to optimize the properties of copper oxide thin film, it is essential to study the physical structure of copper oxide. In current studies, copper oxide thin film has been deposited by RF magnetron sputtering at different substrate bias voltages and oxygen flow rates. The results reveal that the deposition rate decreased when the oxygen flow rate above 4 sccm. SEM image reveal that nanostructure copper oxide was also obtained when the oxygen flow rate was above 4 sccm. On the other hand, no significant effect on the substrate bias voltage toward the sputter deposition rate was observed.

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Nanostructured copper oxides as ethanol vapour sensors

Cited by 124 publications

References 59 publications

Single and networked CuO nanowires for highly sensitive p-type semiconductor gas sensor applications

Single and networked CuO nanowires for highly sensitive p-type semiconductor gas sensor applications

Formation of Hierarchical CuO Nanostructures on Copper Foil by Chemical Bath Deposition for Applications in Superhydrophobic Surfaces

Influence of Oxygen Flow Rate on Sputter Deposition Rate and SEM Image of Copper Oxide Thin Films

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