Fabrication of Metallic Nanodots in Large-Area Arrays by Mold-to-Mold Cross Imprinting (MTMCI)

Kwon, S.; Yan, Xiaoming; Contreras, A. M.; Liddle, J. Alexander; Somorjai, Gábor A.; Bokor, Jeffrey

doi:10.1021/nl051932+

Cited by 37 publications

(32 citation statements)

References 21 publications

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“…compressibility, liquid-gas transitions critical parameters) at large pressures on microporous silica gels [14][15][16][17] and powders, [18] as well as recent studies on the liquid-silica interface [19]. Single-crystal silica surfaces are conveniently used as supports to grow a variety of nanostructures such as nanotubes, [20,21] model array catalysts, [22,23] and metal-on-support model catalysts [24,25]. Combining nanotechnology and surface science techniques towards catalysis applications currently attracts significant interest [26].…”

Section: Introductionmentioning

confidence: 99%

Reactivity screening of silica

Funk

Nurkic

Burghaus

2007

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Reactivity screening of silica

Funk

Nurkic

Burghaus

2007

Applied Surface Science

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“…Another new method we developed for the fabrication of catalytic nanodots is called mold-to-mold cross imprint (MTMCI) [4]. This technique is capable of producing high areal density nanodots of any metal on any surface.…”

Section: Formation Of 2-d Nanocatalyst By Nanolithographymentioning

confidence: 99%

“…The field of metal heterogeneous catalyst developed rapidly by use of model catalyst, first single crystal surface [1], then monodispersed nanoclusters deposited on oxide surface by lithography techniques [2][3][4][5][6][7] or by colloid chemistry [8][9][10][11][12]. While single crystal could reproduce many of the elementary steps of industrial catalytic reactions where there is only one product (quinoline synthesis, carbon monoxide oxidation, and ethylene hydrogenation), for multi-path reaction with several reaction products the selectivity depends on ingredients such as the oxide-metal interface and the presence of a second metal that selectively blocks surface sites.…”

Section: Introductionmentioning

confidence: 99%

The Nanoscience Revolution: Merging of Colloid Science, Catalysis and Nanoelectronics

2008

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The incorporation of nanosciences into catalysis studies has become the most powerful approach to understanding reaction mechanisms of industrial catalysts and designing new-generation catalysts with high selectivity. Nanoparticle catalysts were synthesized via controlled colloid chemistry routes. Nanostructured catalysts such as nanodots and nanowires were fabricated with nanolithography techniques. Catalytic selectivity is dominated by several complex factors including the interface between active catalyst phase and oxide support, particle size and surface structure, and selective blocking of surface sites, etc. The advantage of incorporating nanosciences into the studies of catalytic selectivity is the capability of separating these complex factors and studying them one by one in different catalyst systems. The role of oxide-metal interfaces in catalytic reactions was investigated by detection of continuous hot electron flow in catalytic nanodiodes fabricated with shadow mask deposition technique. We found that the generation mechanism of hot electrons detected in Pt/TiO 2 nanodiode is closely correlated with the turnover rate under CO oxidation. The correlation suggests the possibility of promoting catalytic selectivity by precisely controlling hot electron flow at the oxide-metal interface. Catalytic activity of 1.7-7.2 nm monodispersed Pt nanoparticles exhibits particle size dependence, demonstrating the enhancement of catalytic selectivity via controlling the size of catalyst. Pt-Au alloys with different Au coverage grown on Pt(111) single crystal surface have different catalytic selectivity for four conversion channels of n-hexane, showing that selective blocking of catalytic sites is an approach to tuning catalytic selectivity. In addition, presence and absence of excess hydrogen lead to different catalytic selectivity for isomerization and dehydrocyclization of n-hexane on Pt(111) single crystal surface, suggesting that modification of reactive intermediates by the presence of coadsorbed hydrogen is one approach to shaping catalytic selectivity. Several challenges such as imaging the mobility of adsorbed molecules during catalytic reactions by high pressure STM and removing polymeric capping agents from metal nanoparticles remain.

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“…EUV lithography using a short wavelength of 13.5 nm and 0.3-NA exposure tool has also enabled the printing of 22 nm half-pitch lines (Naulleau et al, 2009). On the other hand, attractive patterning techniques, such as a superlattice nanowire pattern transfer (SNAP) method (Melosh et al, 2003;Green et al, 2007), a mold-to-mold cross imprint (MTMCI) process (Kwon et al, 2005) and a surface sol-gel process combined with photolithography (Fujikawa et al, 2006), are currently proposed and pursued actively. The SNAP method, which is based on translating thin film growth thickness control into planar wire arrays, has enabled the production of molecular memories consisting of 16 nm wide titanium/silicon nanowires.…”

Section: Introductionmentioning

confidence: 99%