Plasma synthesis of catalytic thin films

Thomann, Anne-Lise; Rozenbaum, J.P.; Brault, Pascal; Andreazza, Caroline; Andreazza, Pascal; Rousseau, Bernard; Estrade‐Szwarckopf, H.; Berthet, A.; Bertolini, J.C.; Aires, F.J. Cadete Santos; Monnet, Franck; Mirodatos, C.; Charles, Christine; Boswell, Roderick

doi:10.1351/pac200274030471

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…For this reason, plasma processing, including the APD method, or electrical explosion have attracted a lot of attention because it is possible to not only prepare the nanoparticles or thin films without using an organic capping agent to but also synthesize nanocatalysts at a large scale. [29][30][31][32][33] This is mainly due to the high reactivity of the medium via which the energetic transfer occurs through various forms: excited atoms or molecules, radicals, ions, electrons, etc.…”

Section: Experimental Details 1 Preparation Of N-or P-doped Gan Subst...mentioning

confidence: 99%

Influence of hot carriers on catalytic reaction; Pt nanoparticles on GaN substrates under light irradiation

et al. 2013

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We report the hot carrier-driven catalytic activity of two-dimensional arrays of Pt nanoparticles on GaN substrate under light irradiation. In order to elucidate the effect of a hot carrier in a catalytic chemical reaction, the CO oxidation reaction was carried out on Pt nanoparticles on p- and n-type GaN under light irradiation. Metal catalysts composed of Pt nanoparticles were prepared using two different preparation methods: the one-pot polyol reduction and are plasma deposition methods. Under light irradiation, the catalytic activity of the Pt nanoparticles supported on GaN exhibited a distinct change depending on the doping type. The catalytic activity of the Pt nanoparticles on the n-doped GaN wafer decreased by 8-28% under light irradiation, compared to no irradiation (i.e., in the dark), while the Pt nanoparticles on the p-doped GaN wafer increased by 11-33% under light irradiation, compared to no irradiation. The catalytic activity increased on the smaller Pt nanoparticles, compared to the larger nanoparticles, presumably due to the mean free path of hot carriers. Based on these results, we conclude that the flow of hot carriers generated at the Pt-GaN interface during light irradiation is responsible for the change in catalytic activity on the Pt nanoparticles.

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Section: Experimental Details 1 Preparation Of N-or P-doped Gan Subst...mentioning

confidence: 99%

Influence of hot carriers on catalytic reaction; Pt nanoparticles on GaN substrates under light irradiation

et al. 2013

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“…Most of the studies are related to ultra-fine particles production, direct catalyst deposition on a support [13,14] and also assistance of catalytic reactions [15,16]. Although very few studies are devoted to low pressure plasma deposition of catalytic thin films, the latter is expected to be advantageous for controlling low catalyst content and location [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Carbon/platinum nanotextured films produced by plasma sputtering

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Andreazza

Brault

et al. 2009

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Platinum loaded carbon layers were synthesized by a two-step plasma sputtering process. 200 nm thick columnar (columns with an average diameter of 20 nm) carbon films having a large open porosity were formed in the first step. Using the same plasma system, the films were subsequently loaded with platinum. SEM, TEM and Rutherford backscattering spectrometry analysis show that platinum diffuses into the carbon layer and forms nano-sized particles (mean diameter ca. 3 nm) along and around the carbon nanocolumns and down to the film/support interface. Optimized catalytic layers were formed at low plasma pressure operation (<1 Pa) and had an upper platinum loading limit of about 0.1 mg.cm -2 .

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“…Low temperature plasma has been extensively utilized in catalysis, including plasma-assisted synthesis of catalytic active ultra-fine particles and their deposition on support, plasma regeneration or plasma treatment of catalysts [31][32][33][34][35][36][37]. Most of the conventional methods for preparation of catalysts include high-temperature calcinations/reduction or pyrolysis in an inert atmosphere.…”

Section: Introductionmentioning

confidence: 99%