다양한 연결 분자를 이용한 금 나노 입자 자기 조립 박막에서의 전자 전달 연구

학위논문(석사) - 한국과학기술원 : 화학과, 2002.2, [ vii, 57 p. ]Self-assembly of gold (Au) nanoparticle onto self-assembled monolayers (SAMs) 1,6-hexanedithiol (HDT) or 1,9-nonanedithiol (NDT)-modified Au electrodes was constructed. Cyclic voltammetry (CV) revealed that Au nanoparticle monolayer did not block electron transfer of $Fe(CN)_6^{3-/4-}$ although HDT or NDT monolayers exist between nanoparticle monolayer and electrode. We also prepared SAM of $FcCO_2(CH_2)_{11}SH$ $[Fc=(\eta^5-C_5H_5)Fe(\eta^5-C_5H_4)]$ on Au nanoparticle monolayer. The amount of $FcCO_2(CH_2)_{11}SH$ coverage on Au nanoparticle monolayer is larger than twice of the value on bare Au electrode. Furthermore, consecutive Au nanoparticle layer was successfully constructed on Au nanoparticle monolayer modified with mixed SAM of $FcCO_2(CH_2)_{11}SH$ and NDT. Second, Au nanoparticle monolayer and multilayer with poly (amidoamine) (PAMAM) dendrimer (Generation 4) as cross-linking molecule was prepared on gold and indium tin oxide (ITO) electrodes, and glass substrate. The monolayer formation was confirmed by scanning electron microscope (SEM). Although PAMAM dendrimers are very large and bulky molecules, Au nanoparticle film on dendrimer-modified Au electrode provide conduction pathway for electron transfer of $Fe(CN)_6^{3-/4-}$ Au nanoparticle multilayer with ferrocene-modified dendrimer on gold electrode was constructed and investigated by CV. As the number of layers increases, ferrocene redox currents increase. Au nanoparticle multilayer prepared on ITO electrode was characterized using CV. The quantities of Au oxide formed on Au nanoparticles increase with the number of layers. UV-Vis spectroscopy revealed that nanoparticle plasmon absorbance of Au nanopaticle multilayer on glass substrate increases upon the buildup of the layer.한국과학기술원 : 화학과