Low-temperature growth of ZnO nanorods by chemical bath deposition

Yi, Sung-Hak; Choi, Seokheun; Jang, Jae-Min; Kim, Jung-A; Jung, Woo-Gwang

doi:10.1016/j.jcis.2007.05.006

Cited by 142 publications

(83 citation statements)

References 13 publications

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“…Moreover, the key advantage of the capacitive-type sensor is its selective detection of the specific gas molecules. ZnO nanomaterials have been widely studied for high-technology applications ranging from photonic crystals to light-emitting diodes, photo detectors, photodiodes, and gas sensors [4]. A variety of ZnO nanostructures have been demonstrated, for example, nanowires, nanorods, nanotubes, nanobelts, and nanoflowers.…”

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confidence: 99%

Capacitive Mode Methanol Sensing by ZnO Nanorods Based Devices

Banerjee¹,

Dutta²,

Misra³

et al. 2017

IJMMM

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Abstract-Capacitive mode methanol sensing performance of ZnO hexagonal nanorods based MIS devices having diameters of 40-60 nm and lengths of 460-480 nm, is reported in this paper. ZnO nanorods were synthesized on p-Si substrate by chemical bath deposition method (CBD) using 50 ml aqueous solution of Zinc acetate dihydrate and HMT. The as deposited sensor with Pd catalytic contact in metal-insulator-metal (MIS) configuration offered 99% response magnitude (RM) in the temperature range of (300-325) º C towards 700 ppm methanol concentration. The response time (Rs:140s) and recovery time (Rc:110s) of the methanol sensor at 325º C were also obtained. The sensor was able to detect methanol even down to 10 ppm.Index Terms-Capacitive sensor, CBD, ZnO hexagonal nanorods, methanol sensing. I. INTRODUCTIONRecent advances in nanomaterials provide the opportunity to dramatically increase the response of these materials, as their performance is directly related to exposed surface volume. Detection of toxic and flammable gases is a subject of growing significance in both domestic and industrial environments [1]. Various air pollutants coming from industrial plants, households or automobiles should be controlled in order to keep them below a safe level. This has motivated the researchers to develop various types of gas sensors based on different principles. The conductometric semiconducting metal oxide gas sensors currently constitute one of the most investigated groups of gas sensors. Metal-insulator-semiconductor (MIS) structure attracts the interests as its capacitance (based on surface space charge of semiconductor) is delicately influenced by effective voltage applied on metal electrode for detecting combustible, reducing, or oxidizing gases by conductive measurements [2] The gas sensors used noble metal electrode as a sensing material. The following oxides show a gas response in their conductivity: Capacitive-type sensors have good prospects given that the capacitor structure is so simple enabling miniaturization and achieving high reliability and low cost. In addition, amplification of capacitance is easily performed by oscillator Manuscript

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mentioning

confidence: 99%

Capacitive Mode Methanol Sensing by ZnO Nanorods Based Devices

Banerjee¹,

Dutta²,

Misra³

et al. 2017

IJMMM

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“…Several authors [8][9][10]19] have reported on the buffer effect played by the amino-based ligand during the CBD. No doubt, in fact, that equilibria 1 and 2 regulate the concentration of the Zn 2+ and OH − ions in the solution.…”

Section: Resultsmentioning

confidence: 99%

“…In this context, among the synthetic approaches used to fabricate well defined ZnO 1D nanostructures [3][4][5][6][7], chemical bath deposition (CBD) [8,9] certainly benefits of low temperature requirements and of simple and low-cost equipment in environmentally safe synthetic conditions. Even more important, CBD favours an accurate control of the morphology and the orientation of ZnO nanostructures by tuning the process parameters through the relevant equilibria that are established in the solution [10].…”

Section: Introductionmentioning

confidence: 99%

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ZnO nanorod arrays fabrication via chemical bath deposition: Ligand concentration effect study

Fragalà

Aleeva

Malandrino

2010

Superlattices and Microstructures

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a b s t r a c tA new ligand, N, N, N , N -tetramethylethylenediamine, has been used to grow ZnO nanorods on silicon substrates via a two steps approach. A preliminary seeding on silicon substrates has been combined with chemical bath deposition using a Zinc acetate -N, N, N , N -tetramethylethylenediamine aqueous solution. The used diamino ligand has been selected as Zn 2+ complexing agent and the related hydrolysis generates the reacting ions (Zn 2+ and OH − ) responsible for the ZnO growth. The seed layer has been annealed at low temperature (<200°C) and the ZnO nanorods have been grown on this ZnO amorphous layer. There is experimental evidence that the ligand concentration (ranging from 5 to 50 mM) strongly affects the alignment of ZnO nanorods on the substrate, their lateral dimension and the related surface density. Length and diameter of ZnO nanorods increase upon increasing the ligand concentration, while the nanorod density decreases. Even more important, it has been demonstrated, as proof of concept, that chemical bath deposition can be usefully combined with colloidal lithography for selective ZnO nanorod deposition. Thus, by patterning the ZnO seeded substrate with polystyrene microsphere colloidal lithography, regular Si hole arrays, spatially defined by hexagonal ZnO nanorods, have been successfully obtained.

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“…A variety of ZnO nanostructures have been reported, for example, nanowires, nanorods, nanotubes, nanobelts, and nanoflowers. Among these, ZnO nanorods (NRs) are of particular interest due to their electrical and optical properties [2].…”

Section: Introductionmentioning

confidence: 99%

Structural studies of ZnO nanostructures by varying the deposition parameters

Yunus¹,

Sahdan²,

Ichimura³

et al. 2017

AIP Conference Proceedings

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Effect of precursor's concentration on structure and morphology of ZnO nanorods synthesized through hydrothermal method on gold surface AIP Conference Proceedings 1788, 030120 (2017) Next, for diode application, the ZnO NRs was deposited on tin monosulfide (SnS) coated on indium-tin-oxide (ITO) coated glass substrate (SnS/ITO). The next, the ZnO structural properties were studied from surface morphology, X-ray diffractometer (XRD) spectra, and chemical composition by using field emission scanning electron microscope (FESEM), XRD and energy dispersive X-ray Spectroscopy (EDX). The growth of ZnO NRs on ZnO seed layer was investigated by ZnO seed layer condition while the growth of ZnO NRs on SnS/ITO was investigated by deposition time and deposition temperature parameters. From FESEM images, aligned ZnO NRs were obtained, and the diameters of ZnO NRs were 0.024-3.94 μm. The SnS thin film was affected by the diameter of ZnO NRs which are the ZnO NRs grow on SnS thin films has a larger diameter compared to ZnO NRs grow on ZnO seed layer. Besides that, all of ZnO peaks observed from XRD corresponding to the wurzite structure and preferentially oriented along the c-axis. In addition, EDX shows a high composition of zinc (Zn) and oxygen (O) signals, which indicated that the NRs are indeed made up of Zn and O.

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Low-temperature growth of ZnO nanorods by chemical bath deposition

Cited by 142 publications

References 13 publications

Capacitive Mode Methanol Sensing by ZnO Nanorods Based Devices

Capacitive Mode Methanol Sensing by ZnO Nanorods Based Devices

ZnO nanorod arrays fabrication via chemical bath deposition: Ligand concentration effect study

Structural studies of ZnO nanostructures by varying the deposition parameters

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