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Lu C.-H.,National Cheng Kung University | Hon M.-H.,National Cheng Kung University | Kuan C.-Y.,Thintech Materials Technology Co. | Leu I.-C.,National University of Tainan
RSC Advances | Year: 2016

Tungsten oxides (W18O49) nanowire arrays as effective electrochromic working electrodes were fabricated on seed-free FTO glasses through a facile solvothermal process. XRD, FESEM and TEM were used to characterize the phase, morphology and nanostructure. Uniform monoclinic W18O49 nanowire arrays can be obtained at 180 °C for 5 h. In the assembled electrochromic device the W18O49 nanowire array films show a fast response and switching time, extracted for a 50% transmittance change of 10.8 s for coloration (tc) and 3.1 s for bleaching (tb), which surpass current traditional devices using monoclinic tungsten oxide (WO3) as the electrochromic material. The reasons can be attributed to their large specific surface area, special tunnel structure and non-stoichiometry characteristics. A complementary electrochromic device combining the W18O49 nanowire arrays with Prussian blue film shows a higher optical contrast (59.05% at 632.8 nm) and a faster switching response with a coloration time of 6.9 s and a bleaching time of 1.2 s, superior to the single layer W18O49 nanowire device. The complementary device with excellent electrochromic performance demonstrates a great potential for practical application. © 2016 The Royal Society of Chemistry. Source

Wu H.-Y.,National Cheng Kung University | Hon M.-H.,National Cheng Kung University | Kuan C.-Y.,Thintech Materials Technology Co. | Leu I.-C.,National University of Tainan
RSC Advances | Year: 2015

Spinel Li4Ti5O12 (LTO) has the advantages of superior cycling performance, long and stable voltage plateau, enhanced safety, low cost, and environmental friendliness. LTO nanosheets were synthesized by a hydrothermal method using Ti(OC4H9)4 and LiOH as the raw materials, followed by a subsequent heat treatment to get the desired phase. The effects of the reactant concentration and heat treatment temperature on the phase structure were studied to optimize process parameters for preparing the LTO nanosheets. The results demonstrate that the LTO nanosheets obtained by a hydrothermal method with 2 M LiOH and a subsequent heat treatment at 550 °C exhibit an outstanding stable capacity of 175 mA h g-1 at 0.1 C to 20 C for 40 cycles. The ameliorated electrode-performance is ascribed to the nanostructure of the materials, which provides shorter diffusion-paths and a faster migration rate for both ions and electrons. The newly synthesized nanostructured LTO materials can offer good high rate performance and stability. Li4Ti5O12 nanosheets were developed in this paper for use as anode materials for lithium-ion power batteries with high-rate applications. © The Royal Society of Chemistry.2015. Source

Wu H.-Y.,National Cheng Kung University | Hon M.-H.,National Cheng Kung University | Kuan C.-Y.,Thintech Materials Technology Co. | Leu I.-C.,National University of Tainan
Ceramics International | Year: 2015

Abstract A TiO2(B) nanosheets/SnO2 nanoparticles composite was prepared by the hydrothermal and chemical bath deposition (CBD) methods, and its electrochemical properties were investigated for use as the anode material of a lithium-ion battery. The as-prepared composites consisted of monoclinic-phase TiO2(B) nanosheets and cassiterite structure SnO2 nanoparticles, in which SnO2 nanoparticles were uniformly decorated on the TiO2(B) nanosheets. The TiO2(B)/SnO2 composites showed a higher reversible capacity and better durability than that of the pure TiO2(B) for use as a battery anode. The composite electrodes exhibiting a high initial discharge capacity of 2239.1 mAh g-1 and a discharge capacity of more than 868.7 mAh g-1 could be maintained after 50 cycles at 0.1 C in a voltage range of 1.0-3.0 V at room temperature. The results suggest that TiO2(B) nanosheets coated with SnO2 could be suitable for use as a stable anode material for lithium-ion batteries. In addition, the coulombic efficiency of the nanosheets remains at an average of 93.1% for the 3rd-50th cycles. © 2015 Elsevier Ltd and Techna Group S.r.l. Source

Yang J.C.,National Chiao Tung University | Yeh C.H.,National Tsing Hua University | Chen Y.T.,National Sun Yat - sen University | Liao S.C.,National Tsing Hua University | And 10 more authors.
Nanoscale | Year: 2014

Intriguing functionalities at nano-sized domain walls have recently spawned a new paradigm for developing novel nanoelectronics due to versatile characteristics. In this study, we explore a new scenario to modulate the local conduction of ferroic domain walls. Three controlling parameters, i.e., external electrical field, magnetic field and light, are introduced to the 90° domain walls (90° DWs) of BiFeO3. Electrical modulation is realized by electrical transport, where the mobility of 90° DWs can be altered by gating voltage. We further use the ferromagnetic/antiferromagnetic coupling to reveal the inherent magnetism at the DWs. With an established magnetic nature, magnetotransport has been conducted to introduce magnetic controlling parameter, where a giant positive magnetoresistance change can be observed up to 200%. In addition, light modulated conduction, a core factor for multifunctional applications, is successfully demonstrated (current enhancement by a factor of 2 with 11 W white lamp). These results offer new insights to discover the tunability of domain wall nanoelectronics. © the Partner Organisations 2014. Source


Thintech Materials Technology Co. | Date: 2005-12-20

Injection and extrusion molding machines; machine parts, namely, bimetal barrels for injection and extrusion molding machines.

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