Abstract
摘要:具有結合奈米結構和電子特性之嵌段高分子在學術研究上引起廣泛的研究興趣。近年來利用以自然資源為原料之醣類共聚物自組裝形成奈米結構薄膜,其解析度可達10奈米的結構排列,若將此特性與側鏈含共軛寡聚物之高分子結合,可製備兼顧自組裝結構控制和光電性質的新穎嵌段共聚物系統,預期於新一代綠色電子元件極具應用潛力。此外,嵌段共聚高分子側鏈含有共軛基團摻混奈米材料,如富勒烯衍生物PCBM或是graphene oxide,其側鏈含共軛基團以及奈米材料之間的電荷轉移可以有效地提升載子捕捉能力。然而目前文獻對此類雙嵌段共聚高分子之化學結構與奈米薄膜形態之關係,以及奈米複合薄膜微結構對光電性質之影響均缺乏深入且有系統的探討。因此,本研究將由台大研究團隊之光電高分子及元件專長結合法國CERMAV實驗室之醣類奈米薄膜及結構分析專長,針對上述問題以二年計畫來探討,並期望發展新一代的功能性綠色奈米記憶體元件,茲條列敘述如下:
(1) 合成功能性醣類/側鏈含共軛寡聚物之嵌段共聚物,探討其化學結構及自組裝結構形態之關係。
(2) 探討藉由不同高分子組成與薄膜製備方法調控其奈米結構,並系統化地探討製程參數對於材料的二維與三維奈米尺度堆疊之影響。
(3) 探討此高分子系統所形成奈米結構形態與光電特性之關係,調控最適化之製程並應用於場效應薄膜電晶體、記憶體與感測性電子元件。
(4) 製備雙嵌段高分子與奈米碳材(PCBM 或graphene oxide)奈米自組裝薄膜,並研究不同高分子/奈米碳材比例對於奈米結構形態以及電荷記憶特性之影響。
(5) 製備雙嵌段高分子與奈米碳材複合薄膜之軟性記憶元件於生物可分解性基材(如PLA或是PLGA),以開發軟性綠色記憶體元件,並結合製程條件對記憶體作元件最適化技術和可靠度及穩定性測試,並深入探討元件理論物理機制和分子結構及元件效能間關係。
Abstract: Block copolymers have attracted significant interests due to their unique combination of nanostructure formation and electronic/optoelectronic activity. Recently, new nano-organized thin films made from natural sources of glycopolymers with nano-patterning around 10 nm have been developed by CERMAV. The block copolymers consisted of glycopolymer segment and polymer segment with conjugated moieties have the advantages of self-assembling nanostructures and electronic/optoelectronic properties, such as memory device applications. In addition, the nanocomposites prepared from block copolymers and nanomaterials (such as PCBM and graphene oxide), can improve electrical bistable switching and then enhance memory performance, due to the strong intermolecular charge transfer between electron-donating conjugated moieties and electron-accepting nanomaterials. However, there are several un-addressed issues of glycopolymer-based block copolymers and their nanocomposites, including structure/morphology/properties relationship and the influence of nanostructures on electronic/optoelectronic properties. Therefore, it would be much beneficial to enhance the device performance if we can fully investigate the chemical composition, nanostructures and optoelectronic properties of glycopolymer-based block copolymers and their nanocomposites.
In this proposed project, we will combine the highly complementary teams of CERMAV and NTU with the expertise in polymer synthesis, optoelectronic devices, and glycopolymers. We aim to open a new generation of green flexible memory devices. The following issues will be explored in the two-year project:
(1) Synthesis and properties of new poly(vinyl conjugated oligomer)-block-polysaccharides which will be correlated to their nano-structured morphologies.
(2) Systematic analysis on the nanoscale morphology of poly(vinyl conjugated oligomer)-block-polysaccharide thin-films and correlate with block ratio and side chain length;
(3) Investigation the effect of self-assembled nanostructures on their electronic/optoelectronic properties and memory device characteristics.
(4) Study the morphology and memory device characteristics of poly(vinyl conjugated oligomer)-block-polysaccharide /nanomaterial (such as PCBM and graphene oxide) composite films.
(5) Fabrication of the memory devices based on these diblock copolymers and their nanocomposites on flexible biodegradable substrates (PLA and PLGA), and exploring the memory mechanism and flexible device performance.
Keyword(s)
側鏈含共軛基團高分子
醣類高分子
嵌段共聚物
薄膜結構形態
記憶體元件。
polymers with pendent conjugated moieties
glycopolymers
block copolymers
thin film morphology
memory devices