CAJ | 학술논문

使用接触角、原子力显微镜(AFM)、静电力显微镜(EFM)和傅里叶变换红外(FTIR)光谱对辛基三乙氧基硅烷(C8TES)/十八烷基三氯硅烷(OTS)均相混合自组装单分子膜(SAM)及其形成过程中样品表面的润湿性、表面形貌、表面电势和膜内分子的有序度进行了表征，对采用分步法利用C8TES分子空间位阻制备C8TES/OTS均相混合SAM的反应机制进行了研究。结果表明， C8TES/OTS均相混合SAM表面接触角为105°，样品表面平整、光滑；对样品表面电势进行分析后发现，混合SAM表面电势分布均匀，电势频率分布为典型的正态分布；在均相混合SAM的形成过程中，样品表面电势的分布始终十分均匀，电势频率分布均为典型的正态分布；C8TES/OTS均相混合SAM是一种具有上下两层分子排列密度不同的膜结构的单分子膜，其内部结构至少在500 nm×500 nm到20μm×20μm尺度上是高度均匀一致的，膜内没有明显的特征结构，具有典型的均相混合SAM特征。
사용접촉각、원자력현미경(AFM)、정전력현미경(EFM)화부리협변환홍외(FTIR)광보대신기삼을양기규완(C8TES)/십팔완기삼록규완(OTS)균상혼합자조장단분자막(SAM)급기형성과정중양품표면적윤습성、표면형모、표면전세화막내분자적유서도진행료표정，대채용분보법이용C8TES분자공간위조제비C8TES/OTS균상혼합SAM적반응궤제진행료연구。결과표명， C8TES/OTS균상혼합SAM표면접촉각위105°，양품표면평정、광활；대양품표면전세진행분석후발현，혼합SAM표면전세분포균균，전세빈솔분포위전형적정태분포；재균상혼합SAM적형성과정중，양품표면전세적분포시종십분균균，전세빈솔분포균위전형적정태분포；C8TES/OTS균상혼합SAM시일충구유상하량층분자배렬밀도불동적막결구적단분자막，기내부결구지소재500 nm×500 nm도20μm×20μm척도상시고도균균일치적，막내몰유명현적특정결구，구유전형적균상혼합SAM특정。
The wettability, surface topography, surface potential, and degree of order of a homogeneously mixed octyltriethoxysilane (C8TES)/octadecyltrichlorosilane (OTS) self-assembled monolayer (SAM) were characterized by means of contact angle analysis, atomic force microscopy (AFM), electrostatic force microscopy (EFM), and Fourier transform infrared (FTIR) spectroscopy. The formation mechanism of the SAM was studied as the monolayer was constructed using a stepwise approach, taking advantage of the steric hindrance of C8TES. The SAM was found to have a contact angle of 105° and the formation process of the mixed SAM was obviously different from the SAM formation mechanisms of both pure C8TES and OTS. The AFM and EFM characterizations indicated that the mixed SAM had a smooth surface and a homogeneous surface potential distribution with a typical, normal surface potential frequency distribution. The internal structure was highly homogeneous over regions ranging from 500 nm × 500 nm to 20μm × 20μm in size. The FTIR analysis indicated that the mixed SAM had a double-layer film structure, and that the molecular densities were different in the two layers, with the layer closer to the substrate being denser. This work shows that steric hindrance effects can be used to al ow the stepwise formation of homogeneously mixed SAMs, and that this method is especially applicable to the construction of the homogeneously mixed SAMs composed of two types of molecules having different head groups.