TY - JOUR
T1 - ZnO Functionalization
T2 - Metal-Dithiol Superstructures on ZnO(0001) by Self-Assembly
AU - Tong, Yongfeng
AU - Jiang, Tingming
AU - Qiu, Shunli
AU - Koshmak, Konstantin
AU - Giglia, Angelo
AU - Kubsky, Stefan
AU - Bendounan, Azzedine
AU - Chen, Lin
AU - Pasquali, Luca
AU - Esaulov, Vladimir A.
AU - Hamoudi, Hicham
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/2/8
Y1 - 2018/2/8
N2 - We present a study of the functionalization of a monocrystalline ZnO surface using aromatic dithiols. The aim is to obtain a sulfur-terminated self-assembled monolayer (SAM), which is then used for creation of further molecular superstructures with intercalated metal atoms. These metal-molecule self-assembled structures are characterized by high-resolution X-ray photoelectron spectroscopy (XPS) and near edge X-ray adsorption fine structure (NEXAFS) measurements. Formation of a 5,5- bis(mercaptomethyl)-2,20- bipyridine (BPD) SAM on ZnO(0001) is demonstrated using a protocol developed by us earlier for dithiol assembly on gold, allowing production of standing-up SAMs with free SH groups. Thereafter the formation of a metal intercalated dithiol super lattice is achieved by first grafting metal atoms (Ag or Ni) and then attaching a second BPD molecular layer. Metal atoms bind to both sulfur and the pyridine nitrogens within the SAM. Clear changes in the valence band region near the Fermi level are observed, and the highest occupied system orbital positions are determined along with work function evolution.
AB - We present a study of the functionalization of a monocrystalline ZnO surface using aromatic dithiols. The aim is to obtain a sulfur-terminated self-assembled monolayer (SAM), which is then used for creation of further molecular superstructures with intercalated metal atoms. These metal-molecule self-assembled structures are characterized by high-resolution X-ray photoelectron spectroscopy (XPS) and near edge X-ray adsorption fine structure (NEXAFS) measurements. Formation of a 5,5- bis(mercaptomethyl)-2,20- bipyridine (BPD) SAM on ZnO(0001) is demonstrated using a protocol developed by us earlier for dithiol assembly on gold, allowing production of standing-up SAMs with free SH groups. Thereafter the formation of a metal intercalated dithiol super lattice is achieved by first grafting metal atoms (Ag or Ni) and then attaching a second BPD molecular layer. Metal atoms bind to both sulfur and the pyridine nitrogens within the SAM. Clear changes in the valence band region near the Fermi level are observed, and the highest occupied system orbital positions are determined along with work function evolution.
UR - http://www.scopus.com/inward/record.url?scp=85042179936&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.7b12071
DO - 10.1021/acs.jpcc.7b12071
M3 - Article
AN - SCOPUS:85042179936
SN - 1932-7447
VL - 122
SP - 2880
EP - 2889
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 5
ER -