Browsing by Author "Chiu, Chih-Wei"

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1-(3-Methoxycarbonyl)propyl-2-selenyl-[6,6]-methanofullerene as a n-Type Material for Organic Solar Cells
(2011-07-01)
Chuang, Shih-Ching
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Chiu, Chih-Wei
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Chien, Shang-Chieh
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Chu, Chih-Wei
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Chen, Fang-Chung
Demand for green and renewable energy is stimulating research into future materials for energy production. Thin films of materials possessing both electron accepting and donating functions play a unique role in solar energy technology because of their lightweight, flexibility, and economical, low-temperature, and large-area fabrication. A [60]fullerene derivative,[6,6]-2-selenyl-C(61)-butyric acid methyl ester (SeCBM), has been synthesized in three steps, namely through Friedel-Crafts acylation of selenophene, hydrazone formation and Bamford-Steven reaction. Organic photovoltaic device incorporating SeCBM and the conducting polymer P3HT exhibited an average power conversion efficiency of 3.26% and a champion efficiency as high as 3.81% under AM 1.5G irradiation. (C) 2011 Elsevier B.V. All rights reserved.
Nucleobase-grafted supramolecular polymers for tuning the surface properties
(2014-02-07)
Lin, I. -Hong
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Cheng, Chih-Chia
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Li, Ke-Fong
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Chen, Jem-Kun
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Chiu, Chih-Wei
Nucleobase-grafted polycaprolactone has been prepared which exhibits amorphous nature, rapid photoresponse and controlled surface properties in the solid state owing to the formation of uracil-diamidopyridine (U-DAP) pairs by induced physical cross-linking. In addition, they can self-organize to alter material behavior with light, switching both optical and thermal properties. Remarkable changes in the surface morphology and the contact angle with water were also observed.
Supramolecular Assembly Mediates the Formation of Single-Chain Polymeric Nanoparticles
(2015-10-01)
Cheng, Chih-Chia
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Chang, Feng-Chih
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Yen, Hsiu-Che
;
Lee, Duu-Jong
;
Chiu, Chih-Wei
A breakthrough innovation in water-based polymeric nanoparticles has enabled significant progress in mimicking the folding of natural proteins by generating novel "single-chain polymeric nanoparticles" (SCPNs) via supramolecular interactions. In this study, a practical approach to the living polymerization of functionalized oligo(ethylene glycol) methacrylate monomers allows the incorporation of self-constituted multiple hydrogen-bonded groups into physically cross-linked polymer networks, which enables the formation of highly functionalized SCPNs in an aqueous environment. The newly developed materials are particularly attractive from a practical point of view since they have a very low critical micellization concentration and uniform particle diameters of ca. 25 nm, making them extremely stable under dilute conditions. Concentration-dependent experiments showed that SCPNs formed at polymer concentrations up to 40 mg/mL with no significant change in morphology observed. Moreover, the formed SCPNs had a very high stability in an aqueous solution containing surfactant, suggesting potential for a wide variety of applications as a promising candidate nanocarrier for bioimaging, controlled release, and drug delivery systems.