Presentation Information
[25a-31B-5]Impact of Interaction Between Non-polar Aliphatic Alkyl-Chains and ZnO Polar Surfaces on SAM-Modified ZnO Nanowire QCM Sensors
〇(M1)Guang XI1, Jiangyang Liu1, Wataru Tanaka1, Takuro Hosomi1, Tsunaki Takahashi1, Takeshi Yanagida1,2 (1.Univ. Tokyo, 2.Kyushu Univ.)
Keywords:
nanowires,self-assembled monolayer,QCM sensor
Organic molecular modifications on metal oxide sensor surfaces have been believed to be powerful tools to capture volatile organic molecules (VOCs) by utilizing an interaction between molecules with similar molecular skeletons. Self-assembled monolayer (SAM) is one of such organic molecular surface modification methods for the development of ultrasensitive and selective sensing devices for the detection of chemical substances. Here, we report the impact of interaction between non-polar aliphatic alkyl-chains and ZnO polar surfaces on aliphatic SAM-modified ZnO nanowire QCM sensors. We unexpectedly observed that the adsorptions of alkanes and similar compounds on 1-octylphosphonic acid (OPA) modified ZnO surfaces were substantially suppressed when compared to bare-ZnO surfaces and methylphosphonic acid (MPA) modified surfaces. These results highlight the impact of interaction between non-polar aliphatic alkyl-chains and ZnO polar surfaces, which has highly underestimated as an interaction on polar metal oxide surfaces, on aliphatic SAM-modified ZnO nanowire QCM sensors. In addition, computational simulations give a comprehensive understanding as to above experimental results.