Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 82: Poster Session - Organic Molecules on Inorganic Substrates: Networks and Overlayers
O 82.1: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/EG
Surface properties of en-APTAS SAMs on ZnO surfaces — •Nurhalis Majid1,2, Gerhard Lilienkamp1, and Winfried Daum1 — 1Institute of Energy Research and Physical Technologies, TU Clausthal, Leibnizstraße 4, 38678 Clausthal-Zellerfeld, Germany — 2Research Centre for Physics, LIPI, Kawasan Puspiptek, 15314 Tangerang Selatan, Indonesia
Surface functionalization of ZnO nanowires with N-[3-(trimetoxylsilyl) propyl]ethylenediamine (en-APTAS) self-assembled monolayers (SAMs) provides the base for an NO2 gas sensor with high sensitivity and selectivity [1]. For a better understanding of the attachment of en-APTAS to the ZnO substrate, a comparative AFM, AES and XPS study of the chemical functionalization of undoped Zn-polar ZnO(0001) and nonpolar ZnO(11-20) single crystal surfaces with en-APTAS SAMs has been carried out. Monolayer films are readily deposited on ZnO(0001) by dip coating, while complete monolayer wetting of ZnO(11-20) was not achieved so far. An anomaly of the SiLVV/SiKLL Auger line intensity ratio for the Si atoms of the adsorbed en-APTAS layer is observed on both substrates. Possible implications of this anomaly and of incomplete hydrolysis of en-APTAS for the molecular adsorption geometry are discussed.
[1] M. W. G. Hoffmann et al., Adv. Mater. 26, 8017 (2014)
N. Majid would like to thank the Ministry of Research, Technology and Higher Education of the Republic of Indonesia (RISTEKDIKTI) for the RISETPro Ph.D. scholarship and Indonesian-German Centre for Nano and Quantum Technologies (IG-Nano) for support.