In-Situ Formation of CdS Nanoarrays by Pore-Filling Nanoporous Templates from Degradable Block Copolymers

Lo, Kuan-Hsin; Tseng, Wen-Hsien; Ho, Rong‐Ming

doi:10.1021/ma0628580

Cited by 36 publications

(30 citation statements)

References 35 publications

(61 reference statements)

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“…Of the versatile aspects of BCPs, fabrication of organic-inorganic nanocomposite structures using BCPs as structure directing agents is a well known application. For instance, inorganic sol-gel precursors [23][24][25][26][27] and inorganic nanoparticles [28,29] can be incorporated into one of the constituent blocks having a similar polarity to generate an inorganic nanostructure that is essentially the replica or modulated nanostructure of the initial BCP [30][31][32]. Silica/BCP films with various mesostructures of large characteristic length scales were synthesized through evaporation-induced self-assembly, where amphiphilic polystyrene-block-poly(ethyleneoxide) (PS-b-PEO) diblock copolymer and triblock copolymer (P123) were used as the structure-directing agents [33].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photophysical Properties of Nanopatterned Titania Nanodots/Nanowires upon Hybridization with Silica via Block Copolymer Templated Sol-Gel Process

et al. 2010

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Abstract:We fabricated titanium dioxide (TiO 2 )-silica (SiO 2 ) nanocomposite structures with controlled morphology by a simple synthetic approach using cooperative sol-gel chemistry and block copolymer (BCP) self-assembly. Mixed TiO 2 -SiO 2 sol-gel precursors were blended with amphiphilic poly(styrene-block-ethylene oxide) (PS-b-PEO) BCPs where the precursors were selectively incorporated into the hydrophilic PEO domains. Changing the volumetric ratio of TiO 2 -SiO 2 sol-gel precursor from 5% to 20%, a stepwise structural inversion occurred from nanodot arrays to discrete nanowires. Template free hybrid inorganic nanostructures were produced after the removal of PS-b-PEO by irradiation of UV light. The morphological evolution and photophysical properties were investigated by microscopic studies, UV-visible absorption and photocatalytic properties. OPEN ACCESSPolymers 2010, 2 491

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Section: Introductionmentioning

confidence: 99%

Enhanced Photophysical Properties of Nanopatterned Titania Nanodots/Nanowires upon Hybridization with Silica via Block Copolymer Templated Sol-Gel Process

et al. 2010

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“…To further examine the features in the porefilling process with nanoparticles in BCP thin-film templates, various pore-filling processes have been investigated in our laboratory ( Figure 3). 54 Note that the pore-filling process involves the thrust of capillary force driven from the tunable wetting property of the solution for the templates. Accordingly, methanol is used to promote the wetting tendency of the solution of cadmium ions into the PS template through capillary rise.…”

Section: Nanohybrids From Nanoporous Thin-film Templates and Their Apmentioning

confidence: 99%

“…Figure 3 Schematic illustration of different pore-filling process. 54 Figure 4 (a) Cumulative release profiles of sirolimus from sirolimus-loaded cylindrical nanoarrays (blue triangle), sirolimus-loaded lamellar nanoarrays (green diamond), AAO/sirolimus hybrids (black square), and PS/sirolimus blends (red circle). Inset plots the fitted curve (black line) for the release profile of the sirolimus-loaded cylindrical nanoarrays.…”

Section: Nanohybrids From Nanoporous Thin-film Templates and Their Apmentioning

confidence: 99%

Nanostructured thin films of degradable block copolymers and their applications

She

Hsueh

et al. 2013

NPG Asia Mater

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Nanopatterning using self-assembled thin films of degradable block copolymers (BCPs) has attracted considerable attention and inspired a variety of appealing applications in different research areas. To create useful nanopatterns for practical uses, controlling the orientation of the BCP microdomains is essential. The generation of oriented microdomains in BCP thin films will be discussed in this article. This discussion is followed by a review of methods that use polylactide-containing BCP (that is, polystyrene-b-poly(L-lactide) (PS-PLLA)) thin films to generate nanoporous PS after hydrolysis, which can be used for templated synthesis to create functional nanohybrids. The nanoporous PS thin films with well-oriented cylinder nanochannels can be used for pore-filling various ingredients to create specific drug delivery systems and optoelectronic devices. Moreover, by utilizing templated synthesis, nanoporous ceramics with a high-specific surface area and high porosity can be fabricated for optical applications using hydrolyzed gyroid-forming PS-PLLA as a template for the sol-gel reaction. In addition, the nanolithography applications using silicon-containing BCP (that is, polystyrene-b-polydimethylsiloxane) thin films, which can form inorganic nanoporous templates after oxygen plasma treatment, will be discussed in this review. In recent decades, block copolymers (BCPs) have been extensively investigated because of their ability to self-assemble into various ordered nanostructures, such as spheres, cylinders, gyroids and lamellae, owing to the incompatibility of their constituent blocks and the corresponding chemical junction. 1,2 Well-defined nanostructured phases can be tailored by the molecular engineering of synthetic BCPs to obtain promising features for nanotechnological applications. For such nanostructured materials to prove useful in thin-film applications, thin-film samples with oriented periodic arrays over a large area must be formed to generate a uniform thickness and sufficiently thin films with well-ordered BCP microdomains. Nanoporous materials from BCP thin films have been attracted considerable attention owing to their appealing applications in different research areas. The etching techniques used to generate nanoporous materials can be classified as wet and dry processes depending on the etching methods. 3 The wet etching process is a common approach for fabricating nanoporous materials. By utilizing the degradable character of polymer chains, nanoporous polymers can be fabricated using self-assembled nanostructures through the selective degeneration of one of the constituent blocks. For instance, polylactide-containing BCPs can be used to fabricate nanoporous polymeric materials because of the unstable character of the ester group, which can be hydrolytically decomposed. 4 After hydrolysis of the polylactide segments, a nanoporous thin film with a uniform thickness and domain size can be successfully prepared on different substrates. Consequently, the nanoporous thin films can be used as nanor...

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“…28 The PS-PLLA material had a total number-average molecular weight of 53.9 kg mol -1 with a PLLA volume fraction of 0.25. Hydroxyl terminated PS was prepared using controlled radical techniques followed by ring-opening polymerization to form the PLLA block.…”

Section: Nanolithographymentioning

confidence: 99%

Templating Nanoporous Polymers with Ordered Block Copolymers

2007

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In the midst of this era of nanotechnology and shrinking device size, block copolymers have evolved from their use in traditional application areas (e.g., adhesives, additives, and elastomers) to enable the development of materials for new emerging and more advanced technologies. This review discusses the use of block copolymers to generate nanoporous polymers that can be used either directly, in applications such as membrane filtration, or subsequently as a template for the formation of other nanostructured materials. The work within describes published research from the beginning of 2005 to the present discussing nanoporous materials in the context of: (i) nanolithography and new alignment technologies, (ii) monoliths, (iii) new fabrication techniques, and (iv) membranes. A summary and perspective on the current direction of the stimulating area of block copolymer derived nanoporous materials concludes the review.

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In-Situ Formation of CdS Nanoarrays by Pore-Filling Nanoporous Templates from Degradable Block Copolymers

Cited by 36 publications

References 35 publications

Enhanced Photophysical Properties of Nanopatterned Titania Nanodots/Nanowires upon Hybridization with Silica via Block Copolymer Templated Sol-Gel Process

Enhanced Photophysical Properties of Nanopatterned Titania Nanodots/Nanowires upon Hybridization with Silica via Block Copolymer Templated Sol-Gel Process

Nanostructured thin films of degradable block copolymers and their applications

Templating Nanoporous Polymers with Ordered Block Copolymers

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