Multifunctional CuO nanowire devices: p-type field effect transistors and CO gas sensors

Liao, Lei; Zhang, Zhou; Yan, Bin; Zheng, Zhe; Bao, Qiaoliang; Wu, Tom; Li, Chang Ming; Shen, Zexiang; Zhang, Jixuan; Gong, Hao; Li, Jinchai; Yu, Ting

doi:10.1088/0957-4484/20/8/085203

Cited by 354 publications

(220 citation statements)

References 27 publications

Supporting

Mentioning

201

Contrasting

Unclassified

Order By: Relevance

“…Recently, the potential of CuO nanowires as building-blocks of new devices has been pointed out [10][11][12][13][14]. Among the different techniques to synthesize CuO nanowires, such as electro-spinning [17] and template-assisted growth [11], the direct oxidation of Cu foils [14][15][16] is easy to implement and scalable, providing pleasing results in terms of crystallinity and material quality [14].…”

Section: Introductionmentioning

confidence: 99%

“…Among the different techniques to synthesize CuO nanowires, such as electro-spinning [17] and template-assisted growth [11], the direct oxidation of Cu foils [14][15][16] is easy to implement and scalable, providing pleasing results in terms of crystallinity and material quality [14]. These facts are triggering the research on one-dimensional (1D) CuO nanostructures [5,12,13,15,16], but the scope of their sensing characteristics remains uncompleted according to the authors' best knowledge since the studies performed with individual CuO nanowires have been limited up to now [12,13,15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Shao

Hernández-Ramírez

Prades

et al. 2014

Applied Surface Science

View full text Add to dashboard Cite

Copper (II) oxide (CuO) is a metal oxide suitable for developing solid state gas sensors.Nevertheless, a detailed insight into the chemical-to-electrical transduction mechanisms between gas molecules and this metal oxide is still limited. Here, individual CuO nanowires were evaluated as ammonia (NH 3 ) and hydrogen sulphide (H 2 S) sensors, validating the p-type character of this semiconductor. The working principle behind their performance was qualitatively modelled and it was concluded that adsorbed oxygen at the surface plays a key role necessary to explain the experimental data. Compared to their counterparts of SnO 2 nanowires, an appreciable sensitivity enhancement to NH 3 for concentrations below 100 ppm was demonstrated.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Shao

Hernández-Ramírez

Prades

et al. 2014

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…The large number, around 500 NWs observed by optical microscopy, leads to an estimated value of 28 fF for each NW which is similar to 21 fF, previously reported in the bibliography for a single CuO NW. 19 The RC product, calculated from (R s þR L )ÁC mNW , is represented against R L in red dashed lines in Figures 4(a) and 4(b), showing a fairly good correlation between the model and the experimental data. This means that, unlike other metal oxide NW photodetectors, the time response is mainly limited by the RC product without traces of surface persistent effects.…”

mentioning

confidence: 69%

“…[13][14][15] Different growth methods have been used for the synthesis of CuO NWs, such as chemical, 16 template-assisted techniques, 2 or direct oxidation of regular Cu foils. [17][18][19] The latter has been demonstrated to be an easy and cost-effective method where no catalysts are needed. In this paper, we are reporting the synthesis of p-type CuO NWs and their deposition on n-type AZO electrodes by alternating current (AC) DEP.…”

mentioning

confidence: 99%

Fast response ZnO:Al/CuO nanowire/ZnO:Al heterostructure light sensors fabricated by dielectrophoresis

Marín

García-Núñez

Ruiz

et al. 2013

Applied Physics Letters

View full text Add to dashboard Cite

Metal oxide nanowire (NW) photoconductors tend to exhibit high photoconductive gains and long recovery times mainly due to surface effects. In this work, p-type CuO NWs are synthesized by direct oxidation of copper and deposited on n-type ZnO:Al electrodes by dielectrophoresis. The heterostructure is electro-optically characterized showing recovery times in the 10 ls range, mainly limited by the resistance-capacitance product of the equivalent circuit, without signs of persistent effects. The fast response is attributed to short transit times across space charge regions built between CuO and ZnO:Al materials and fast carrier recombination at neutral regions. V C 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4811128] Metal oxides (MOs) are attractive compounds for industrial purposes since high-quality crystal nanowires (NWs) can be obtained by cost-effective methods that do not require expensive vacuum systems or environmentally unfriendly chemical reactants. The high surface-to-volume ratio of such nanostructures leads to the enhancement of the device sensitivity prompting their use as building blocks in low-cost optical, biological, and gas sensors. [1][2][3][4] Regarding light detectors, NWs may help to reduce the operation voltages of high-gain sensors through the proximity of the surface and the subsequent enhancement of the local electric field. In addition, their small dimensions open possibilities for the integration of NWs from different materials or with different structures such as core-shell, p-n junctions, or quantum well superlattices. 5,6 However, the development of NW-based devices has to face issues such as the lack of performance reproducibility or the need for advanced methods to handle and manipulate nanostructures on a high demand basis. Dielectrophoresis (DEP) has long been used in biochemistry to separate biomolecules, but nowadays, it has also been proved to be a costeffective technique to align NWs between metal electrodes. 7,8 The technique is highly scalable and makes possible the precise placement of multiple NWs on Si integrated circuits at room temperature. Thus, ZnO NW devices have been fabricated using this method on Au electrodes. 9 Due to their high conductance and mechanical stability, Al-doped ZnO (AZO) is an alternative material to metals for the preparation of DEP electrodes. Moreover, its visible transparency also enables the alignment of NWs on desired locations of transparent substrates aiming at the development of sensors in transparent electronics.Concerning the performance of NW devices, the understanding of the surface effects is crucial since many of the electrical and optical characteristics are strongly influenced by surface electronic states. On many MO-NW light sensors, these surface effects lead to obtain photoresponse values well beyond those achieved in mesoscopic devices, at the expense of showing long recovery times. 10,11 Unfortunately, these slow transients hinder their practical application in many fields.Recently, p-type cupric oxide (CuO) NWs ha...

show abstract

“…그 중 나노선 구조는 여러가지 물질을 나노단위 두께의 선형태로 성장시킨 구조로써, 표면적이 크다는 구조적인 특성상 센서, [3][4][5][6][7][8][9] 태양전지, 10-12) 의료 [13][14][15][16] …”

Section: -2)unclassified

Synthesis of Vertically Aligned CuO Nanorods by Thermal Oxidation

Kim¹,

Jung²,

Kim³

2013

Korean. J. Mater. Res.

View full text Add to dashboard Cite

A simple thermal oxidation of Cu thin films deposited on planar substrates established a growth of vertically aligned copper oxide (CuO) nanorods. DC sputter-deposited Cu thin films with various thicknesses were oxidized in environments of various oxygen partial pressures to control the kinetics of oxidation. This is a method to synthesize vertically aligned CuO nanorods in a relatively shorter time and at a lower cost than those of other methods such as the popular hydrothermal synthesis. Also, this is a method that does not require a catalyst to synthesize CuO nanorods. The grown CuO nanorods had diameters of ~100 nm and lengths of 1~25 µm. We examined the morphology of the synthesized CuO nanorods as a function of the thickness of the Cu films, the gas environment, the oxidation time, the oxidation temperature, the oxygen gas flow rate, etc. The parameters all influence the kinetics of the oxidation, and consequently, the volume expansion in the films. Patterned growth was also carried out to confirm the hypothesis of the CuO nanorod protrusion and growth mechanism. It was found that the compressive stress built up in the Cu film while oxygen molecules incorporated into the film drove CuO nanorods out of the film.

show abstract

Multifunctional CuO nanowire devices: p-type field effect transistors and CO gas sensors

Cited by 354 publications

References 27 publications

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Fast response ZnO:Al/CuO nanowire/ZnO:Al heterostructure light sensors fabricated by dielectrophoresis

Synthesis of Vertically Aligned CuO Nanorods by Thermal Oxidation

Contact Info

Product

Resources

About