Production of gas phase zinc oxide nanoclusters by pulsed laser ablation

Ozerov, Igor; Bulgakov, Alexander V.; Nelson, Dmitry K.; Castell, R.; Marine, W.

doi:10.1016/j.apsusc.2005.01.084

Cited by 29 publications

(19 citation statements)

References 20 publications

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“…This band with its typical asymmetric shape corresponds to PL band of ZnO [13,14] arising due to near band edge excitonic recombination. The dominance of PL band at large delays, in our case, confirms that ZnO clusters are being formed by cooling due to collisions of plasma species with the species of the ambient air [15]. The blue shift of 42 meV of photoluminescence peak position of ZnO nanoclusters with respect to that of bulk ZnO observed under similar excitation conditions conclusively demonstrates the quantum confinement effect.…”

supporting

confidence: 85%

“…Pulsed laser deposition at high background pressure may lead to the growth of nanostructures. The size of nanostructures can be controlled by varying pressure and target to substrate distance as size of gas suspended nanoparticles decreases at sufficiently away from the target due to fragmentation [15]. On the other hand, the formation of nanoparticles in plasma plume during PLD process is the major cause of increasing surface roughness of the pulsed laser deposited thin films at high background pressure.…”

Section: Discussionmentioning

confidence: 97%

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Gas suspended ZnO clusters and pulsed laser deposition of ZnO thin film

Thareja

Mohanta

2010

Phys. Status Solidi (c)

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Spectroscopic investigations are made to study the formation of oxides due to cooling of the laser ablated plasma species by collision with species of the ambient and the gas phase nanoparticles synthesis, thus providing a novel way to understand the transportation of nanoparticles and of control of particle size. A comprehensive study done on oxide films using pulsed laser deposition technique for possible laser oscillations in UV region of electromagnetic spectrum, in particular of ZnO is presented. Rayleigh scattering and photoluminescence (PL) technique are used to confirm the formation of clusters in gaseous phase. The intensity of the PL emission band increases with increase in time delays of probe pulse with respect to ablating pulse, however the intensity of Zn atomic transitions decreases. The observed emission band falls in the UV spectral region of PL of ZnO, and is attributed to excitonic recombination in ZnO clusters formed in vapor phase. The clustering of grains could be the major cause of increased surface roughness of ZnO thin films deposited by PLD at high pressure. We have deposited quality ZnO films by PLD at moderate pressure in oxygen ambient. X‐ray diffraction spectrum of film shows that grains are well oriented along c‐axis. The PL profiles of films show strong UV emission band, and weak violet and green emission band. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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supporting

confidence: 85%

Section: Discussionmentioning

confidence: 97%

Gas suspended ZnO clusters and pulsed laser deposition of ZnO thin film

Thareja

Mohanta

2010

Phys. Status Solidi (c)

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“…Meanwhile, today a large amount of information has accumulated on processes induced by thermal energy, delivered to the initial reagents by light mostly in the form of laser radiation. Thus, for example, methods of laser deposition (laser ablation), in which the material of the target is vaporized at the focus of an intense laser beam and is subsequently deposited in the form of colloidal solutions and nanocrystalline films, have been used successfully for the synthesis of TiO 2 [257][258][259][260][261][262], ZnO [263][264][265][266][267][268][269][270][271][272][273], SnO 2 [274], WO 2 [275], FeO [276], Fe 2 O 3 [277], WS 2 [278], CdSe and CdTe [279], Bi 3 Te 2 [280], Se [281], and Si [282,283] nanoparticles and TiO 2 /WO 3 [284] and TiO 2 /Pt [285] nanocomposites.…”

Section: Formation Of Semiconductor Nanoparticles and Change Of Theirmentioning

confidence: 99%

Photochemical formation of semiconducting nanostructures

et al. 2008

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Existing data on photochemical and photocatalytic approaches to the formation of semiconducting nanoparticles and also binary semiconducting nanostructures and nanocomposites of semiconductors with metals and polymers are reviewed. The nature of the effect of irradiation on the synthesis and properties of the obtained nanostructures and the possibility of photocatalytic control of the structural and spectral parameters of nanostructural semiconducting systems are examined.The accumulation of data on the properties of semiconducting (SC) nanomaterials, which has occurred particularly rapidly in the last 7-10 years, has opened up ever more alluring prospects for their application as light-sensitive and light-emitting components in nanophotonics [1-3], nanophotocatalysis [2,[4][5][6][7], biosensorics [8][9][10][11], and other important fields. The possibility of practical utilization is an important factor that has stimulated the search for and study of the processes involved in the formation of nanomaterials. On this account an enormous number of publications have now accumulated on the improvement of existing and development of new methods for the synthesis of semiconducting nanoparticles and nanostructures (e.g., see the reviews [6, 12-15]). A special position among them is occupied by methods based on photochemical transformations conducted either for the purpose of synthesis and directing it along a desired path or for improving the characteristics of nanostructures produced by other methods.Photochemical methods of synthesis have proved more effective than the production of nanomaterials by traditional synthetic approaches, and in a number of cases only they make it possible to achieve the assigned aim. For this reason the synthesis of semiconducting nanostructures and their modification under the conditions of photoirradiation are constantly attracting the attention of investigators, and the number of publications devoted to these questions is constantly increasing. We note, however, that they nevertheless remain disjointed.In view of the foregoing an attempt is made in the present article to organize existing data, to identify the most important directions for research and development, and thus to assess the current state of development of photochemical approaches to the formation of semiconducting nanostructures. Analysis of data on the photochemical formation and post-synthesis photochemical treatment of semiconducting nanostructures and multicomponent nanocomposites, including the nanoparticles of metals and polymers in addition to semiconductors, showed that in spite of the variety and diversity of the proposed approaches all the papers can be ascribed to only three courses: synthesis, synthesis control, and changing the characteristics of the semiconducting nanostructures. For this reason in this review photochemical approaches to the synthesis of nanoparticles of metal chalcogenides, binary semiconducting nanostructures, and nanocomposites consisting of semiconducting and conducting polymers are examin...

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“…Pulsed laser deposition (PLD) has recently been recognised as a suitable technique for the production of FE device-quality ZnO nanowires/nanorods with the corresponding growth mechanisms debated by the authors [15][16][17]. Here we have developed a novel laser ablation source in which the plume expands along a direction parallel to the substrate surface for deposition, thus allowing for simultaneous mass analysis with the help of an insitu reflectron time-of-flight (ReTOF) mass spectrometer.…”

Section: Introductionmentioning

confidence: 98%