Micropatterns constructed from Au nanoparticles

Lu, Conghua; Wu, Nianzu; Jiao, Xiaoming; Luo, Chuan; Cao, Weixiao

doi:10.1039/b301059g

Cited by 27 publications

(18 citation statements)

References 18 publications

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“…The tailorable arrangement of nanoscale materials through directed-mechanisms has proven to be the most practical method to create ordered arrangements of nanoparticles in solution (8)(9)(10)(11)(12)(13)(14)(15); crystalline nanoparticle aggregates have potential implications for the development of materials with unique plasmonic (16,17), photonic (18,19), electrical (20), and magnetic properties (21). Previous strategies developed to create well-ordered nanoscale assemblies have used electrostatic interactions (11,12), hydrogen bonding networks (10,13), and peptide recognition properties (9). Over a decade ago, we introduced the concept of synthetically programmable particle assembly through the use of DNA and polyvalent oligonucleotide nanoparticle conjugates (22).…”

Section: Dna Materials ͉ Saxs ͉ Self Assemblymentioning

confidence: 99%

Assembly and organization processes in DNA-directed colloidal crystallization

Macfarlane

Lee

Hill

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

146

143

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We present an analysis of the key steps involved in the DNAdirected assembly of nanoparticles into crystallites and polycrystalline aggregates. Additionally, the rate of crystal growth as a function of increased DNA linker length, solution temperature, and self-complementary versus non-self-complementary DNA linker strands (1-versus 2-component systems) has been studied. The data show that the crystals grow via a 3-step process: an initial ''random binding'' phase resulting in disordered DNA-AuNP aggregates, followed by localized reorganization and subsequent growth of crystalline domain size, where the resulting crystals are well-ordered at all subsequent stages of growth.DNA materials ͉ SAXS ͉ self assembly T he chemical and physical properties of most materials are determined by the placement of individual atoms relative to one another (1-4). These atom-atom interactions include forces such as covalent and ionic bonds, Van der Waals forces and London dispersion forces. However, in the field of nanomaterials, the length scales of particle assembly are significantly larger and the assembly process is governed by a more complicated set of interactions (5-7). The tailorable arrangement of nanoscale materials through directed-mechanisms has proven to be the most practical method to create ordered arrangements of nanoparticles in solution (8-15); crystalline nanoparticle aggregates have potential implications for the development of materials with unique plasmonic (16, 17), photonic (18, 19), electrical (20), and magnetic properties (21). Previous strategies developed to create well-ordered nanoscale assemblies have used electrostatic interactions (11, 12), hydrogen bonding networks (10, 13), and peptide recognition properties (9). Over a decade ago, we introduced the concept of synthetically programmable particle assembly through the use of DNA and polyvalent oligonucleotide nanoparticle conjugates (22). Recently, we (23,24) and the Gang group (25) independently used these principles to construct highly-ordered nanoparticle crystallites via DNA hybridization, where crystal type and lattice parameters can be programmed through design of DNA linker.The formation of these crystals involves multiple types of molecular interactions that are highly dependent and predictable based on the DNA base sequence (22,(26)(27)(28), where the hybridization of the DNA linkers drives the crystallization process. Moreover, the ultimate structure formed is typically the one that maximizes the number of hybridization events, and therefore, if enough thermal energy is provided, the system will typically equilibrate to this structure (23,25,29,30). Indeed, only highly-ordered crystalline aggregates present the thermodynamically most stable arrangement of nanoparticles, because they allow for a maximum of nearestneighbor complementary DNA interactions.Previous work has shown that the complexity of the nanoparticle systems studied thus far necessitates significant thermal annealing to create the thermodynamically favorable crystal structu...

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Section: Dna Materials ͉ Saxs ͉ Self Assemblymentioning

confidence: 99%

Assembly and organization processes in DNA-directed colloidal crystallization

Macfarlane

Lee

Hill

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

146

143

View full text Add to dashboard Cite

show abstract

“…In self-assembly, specific non-covalent interactions are fundamental in organizing atomic, molecular, and other nanoentities leading to spontaneously formed, hierarchical, complex architectures. Non-covalent interactions such as hydrogen-bonding, electrostatic interactions, van der Waals interactions, surface wettability at interfaces, surface free energy, chemical conjugations, capillary forces, templation, and patterning are vital aspects of spontaneous or directed assembly [14][15][16][17][18][19] . The interactions between nanoparticles are most likely dominated by van der Waals forces.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of novel SnO2 quantum cubes and their selfassembly

Liu

et al. 2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Nano-structured cubic SnO 2 crystalines were successfully synthesized through solvothermal route. The obtained products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM). The study showed that, the SnO 2 particles were rutile structured and almost uniformly cube shaped crystals in quantum size (3-8 nm). Self-assembly behavior of the cubic SnO 2 quantum dots was also observed. The synthesis process can be defined as an nonhydrolysis (NH) hydroxylation reaction provided by the amide elimination of carboxylated precursors. The formation of cubic morphology of SnO 2 can be ascribed to the mild reaction featured by high nucleation rate and low growth rate, surface energy difference of the crystallographic facets of SnO 2 and the passivation effect of the starting material-dodecylamine which drastically reduced the dipole interation. The selfassembly of the cubic SnO 2 quantum dots was driven by van der Waals force and capillary force.

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“…[19] In one cycle of fabrication a bilayer of DR/MP-AuNPs was deposited on each side of the plate. Figure 1 shows the UV-vis spectra of the DR/MPAuNPs films as a function of the deposition cycle.…”

Section: Dr/mp-aunp Filmsmentioning

confidence: 99%

“…This converts the weak hydrogen bonds between the layers of the exposed areas of the film to covalent bonds, [19] but leaves the bonds of the unirradiated areas unchanged. The exposed film was then instantly developed in SDS aqueous solution; the unirradiated regions of the film were removed completely.…”

Section: Dr/mp-aunp Film Patternmentioning

confidence: 99%

Selective Electroless Deposition of Cu on an Ultrathin Au Film Pattern

Zhang

Cong

et al. 2004

Macromol. Rapid Commun.

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Summary: In this report an ultrathin Au nanoparticle (AuNP) film composed of photosensitive diazoresin (DR) and mercaptophenol (MP) capped AuNPs (MP‐AuNPs) was fabricated by self‐assembly (SA). The DR/MP‐AuNP film was then patterned through a photomask by selective exposure to UV light and instantly developed in sodium dodecyl sulfate (SDS) aqueous solution. After sintering at 550 °C to remove the organic components, the DR/MP‐AuNPs formed AuNPs. Taking advantage of the catalytic susceptibility of AuNPs toward electroless deposition of Cu, a Cu film micropattern with fine resolution (ca. 2–3 μm) and considerable thickness (ca. 130 nm) was prepared.SEM image of the micropatterned Cu film on a silicon substrate; scale bar: 10 μm.magnified imageSEM image of the micropatterned Cu film on a silicon substrate; scale bar: 10 μm.

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Micropatterns constructed from Au nanoparticles

Cited by 27 publications

References 18 publications

Assembly and organization processes in DNA-directed colloidal crystallization

Assembly and organization processes in DNA-directed colloidal crystallization

Synthesis of novel SnO2 quantum cubes and their selfassembly

Selective Electroless Deposition of Cu on an Ultrathin Au Film Pattern

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