本研究計畫是設計及製備多層級孔洞奈米網狀結構且表面富異質原子參雜之碳材料，作為表面增強拉曼散射光譜術之基材，應用於染料分子感測之領域。首先藉由調控溶劑與均聚物高分子間相分離驅動力互動製備無序多層級孔洞結構之薄膜，或是調控嵌段共聚物微相分離奈米結構自組裝特性形成不同維度(零維、一維、二維及三維)之奈米結構(如奈米球、奈米柱、奈米板或是雙連續相之奈米結構)，製備多元相形態及尺寸可調控的奈米孔洞結構之薄膜，並進一步交聯高溫碳化形成多層級孔洞碳材料。另外建立多層級孔洞碳材料之幾何結構(孔洞形態、尺寸大小/尺寸分佈、孔隙度、表面積、石墨化程度及奈米結構有序性)、化學組成(異質原子組態與成份)和電子軌域能階(導帶、價帶、費米能階及功函數)之關係，有助於了解染料分子在碳材之電荷轉移化學機制以及對應拉曼增強因子在不同雷射光波長(能量)之表現。 ;In the research project, we aim to fabricate hierarchical porous carbon (HPC) nanostructures with heteroatom-rich functional groups for molecular sensing through surface-enhanced Raman scattering (SERS) spectroscopy. Unique architectures of HPC nano-structures based on pyrolysis of porous polymer thin films provide a new design strategy for fabricating SERS substrates. First, hierarchical porous polymer films with engineered morphology will be fabricated by controls over the phase separation between solvent and homopolymer, or by block copolymer nanodomains with structural diversity (such as sphere, cylinder, lamella or continuous network phase) and tunable dimensions (zero-, one-, two- and three-dimension) though self-assembly and self-ordering. The resultant porous films will be cross-linked and pyrolyzed to form HPC nanostructures. Next for HPC nanostructures, we aim to establish correlations between geometric structures (such as porous morphology, size/size distribution, porosity, surface area, the degree of graphitization and spatial order of nanostructures), chemical compositions (hetero-atom configuration and component), and electron structures as well as energy levels (conduction band, valence band, Fermi level and work function). To gain the structural, chemical and electronic information will help us clearly realize the chemical mechanism of charge transfer and the SERS performance based on evaluation of Raman enhancement factor for absorbed dye molecules on the HPC nanostructures.
