A long-chain dialkylated olefin, 2C18 was found to form a close-packed, highly insulating self-assembled monolayer (SAM) on Si(111) via Si–C bond formation. The IR absorption spectra of the 2C18-SAM show that the alkyl chains are densely packed with an all-trans conformation. The threshold voltage to initiate the scanned probe oxidation (SPO) of the 2C18-SAM-covered Si(111) was ca. 9 V, which is much higher than the previously reported voltages for organic monolayers on Si or SiO2/Si substrates.
一种长链二烷基化烯烃,2C18,通过Si-C键的形成,在Si(111)表面形成了一种紧密堆积、高绝缘性的自组装单层(S
AM)。2C18-S
AM的红外吸收光谱显示,烷基链以全反式构象密集堆积。在2C18-S
AM覆盖的Si(111)上启动扫描探针氧化(
SPO)的阈值电压约为9 V,这远高于先前报道的有机单层在Si或SiO2/Si基底上的电压。