Super-hydrophobic/super-hydrophilic patterning of gold surfaces by photocatalytic lithography

Notsu, Hideo; Kubo, Wakana; Shitanda, Isao; Tatsuma, Tetsu

doi:10.1039/b418884e

Cited by 121 publications

(89 citation statements)

References 17 publications

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“…The contact angles for these functionalized surfaces differed from those for both the hydrophilic gold surfaces (56°) and the azide-containing mixed monolayers (77°), each of which is in agreement with previously recorded [1,6] - [a] 56.5 +/− 1.5 50% N 3 on Au - spectrophotometer. All imaging was conducted at room temperature in air.…”

Section: X-ray Photoelectron Spectroscopysupporting

confidence: 77%

Heterogeneous Catalysis Through Microcontact Printing

Spruell

2011

The Power of Click Chemistry for Molecular Machines and Surface Patterning

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Section: X-ray Photoelectron Spectroscopysupporting

confidence: 77%

Heterogeneous Catalysis Through Microcontact Printing

Spruell

2011

The Power of Click Chemistry for Molecular Machines and Surface Patterning

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“…The reduction of the surface potential strength by the increment of size 27 suggests that a bare gold surface in the absence of hydrophilic citrate anion was exposed on the larger Au nanoparticle surface. In addition, a bare gold surface possesses a hydrophobic character, 46 and ETMS at the glass surface serves as the adsorption site for Au nanoparticles. These facts might represent that an attractive interaction between Au nanoparticles is the hydrophobic interaction of a bare gold surface for Au nanoparticles.…”

Section: Modulation Of Au Nanoparticle Deposition By Organosilanesmentioning

confidence: 99%

Gold Nanoparticle Monolayer Formation on a Chemically Modified Glass Surface

2009

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Physicochemical analyses of Au nanoparticle monolayer formation on a glass surface functionalized with 3-aminopropyltrimethoxysilane (APTMS) and ethyltrimethoxysilane (ETMS) were performed for fabricating a nanoarchitecture of metal nanoparticles using self-assembly. The Au nanoparticle surface density on the functionalized glass surface correlated linearly with the optical response because of Au-nanoparticle localized surface plasmon resonance (LSPR). This relation enabled assessment of the Au nanoparticle deposition. A Frumkin isotherm showed the deposition of Au nanoparticles on the APTMS or APTMS/ETMS functionalized glass surface. For an APTMS-derivatized surface, the affinity between the Au nanoparticles and the surface decreased with the lowering of the APTMS surface coverage. The interaction parameter exhibited attractive interaction of 30-nm-diameter Au nanoparticles; 12 nm particles were repulsive. Adsorption isotherm experiments using Au nanoparticles on glass surfaces with an APTMS and ETMS mixed layer suggest that hydrophobic interaction between Au nanoparticles' bare gold surfaces caused the attractive interaction among 30-nm-diameter nanoparticles.

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“…Hence, instead of assembling into a golden sphere as described previously (Figure 1), a black sphere ( Figure 4A) is formed when a drop of dichloromethane is introduced into water dispersed with the Au-CNT nanowires. In a subsequent step, the functionalized (thiol) nanowires were irradiated by UV light for 3.5 h so that the UV light photo-oxidizes the gold helping to remove the thiol groups from the gold surfaces, 30 and hence allowing the gold to return to a hydrophilic state 29 (see Supporting Information for details), once again changing the hydrophobichydrophilic balance between the Au and CNT segments and the sphere flipping back to the one with golden surface ( Figure 4B) in the presence of the dichloromethane drop. Such turnover and complete reconstruction of the assembled structure, via photoinduced surface modification, could be used effectively in applications such as smart delivery systems, which could be remotely reconfigured (inside out) to release or expose species that could be attached to specific terminal segments of the nanowires.…”

mentioning

confidence: 99%

Controlled Manipulation of Giant Hybrid Inorganic Nanowire Assemblies

Shaijumon

Ajayan

2008

Nano Lett.

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The ultimate goal of nanotechnology is the design and fabrication of nanosize building blocks with multiple functionalities and their assembly into large-scale functional structures that can be controllably manipulated. Here we show that hybrid inorganic multisegmented nanowires, with hydrophobic carbon nanotube tails and hydrophilic metal nanowire heads, allow the assembly and manipulation of massive ordered structures in solution, reminiscent of the organic molecular micellar assembly. Further, properly designed assemblies can be manipulated using external stimuli such as magnetic field and light. The hybrid nanowires can have multiple segments including magnetic components, allowing the assembly to be manipulated by external magnetic field. The assembled structures can also be manipulated by modifying the hydrophobicity of the respective components via chemical functionalization and optical irradiation. This approach brings the concept of environment sensitive self-assembling nanomaterials closer to reality.The design and building of mesoscale constructs of multifunctional attributes 1-3 could have a big impact on technologies such as drug delivery and microfludics. [4][5][6] Recently, Link et al. 2,7 has demonstrated the use of porous silicon as the building block for making smart materials. However, limited by the simple one-component system, it is difficult to incorporate additional functions into such designs. In order to provide broader capabilities, it is clear that materials of wider functionalities should be considered. One-dimensional nanoscale building blocks 8 such as nanotubes, 9-14 nanowires, [15][16][17][18][19] and their hybrids 20-23 could prove to be valuable materials in this endeavor. A previous report by Park et al. 22 showed that the amphiphilic properties of certain nanowires could be used to assemble structures based on the selfinteraction between nanowires. Yet, the true strength of such system lies in the ability to build complex structures that are responsive in real time to their environment. Such ability can be afforded by the interaction between the nanostructure and the environments (akin to surfactants). Here, we show for the first time that appropriately designed hybrid nanowires can be used to generate structures that can respond to their environment and can be manipulated using various external stimuli.Our approach is based on the use of one-dimensional hybrid nanowires consisting of multiple segments with hydrophobic carbon nanotubes on one end and hydrophilic metal nanowires on the other. 23 Through the hard template approach, the hybrid nanowire is fabricated by combination of electrodeposition and chemical vapor deposition for the

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Super-hydrophobic/super-hydrophilic patterning of gold surfaces by photocatalytic lithography

Cited by 121 publications

References 17 publications

Heterogeneous Catalysis Through Microcontact Printing

Heterogeneous Catalysis Through Microcontact Printing

Gold Nanoparticle Monolayer Formation on a Chemically Modified Glass Surface

Controlled Manipulation of Giant Hybrid Inorganic Nanowire Assemblies

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