TY - JOUR
T1 - Potential-Controlled Organization of 2,3-Diphenyl-5,7-di(thiophen-2-yl)thieno[3,4- b]pyrazine Adsorbed on Au(111) and Au(100) Electrodes
AU - Afraj, Shakil N.
AU - Chen, Chingche
AU - Velusamy, Arulmozhi
AU - Liu, Jia Hao
AU - Yau, Shuehlin
AU - Chen, Ming Chou
N1 - Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/8/4
Y1 - 2022/8/4
N2 - The 2,3-diphenyl-5,7-di(thiophen-2-yl)thieno[3,4-b]pyrazine (DPDTTP) molecule is an organic molecule that is often used to produce photovoltaics and light-emitting diodes. The orientation of an organic semiconductor molecule at the metallic interface can affect the charge injection efficiency. The current study employed in situ scanning tunneling microscopy (STM) to examine the adsorption orientation of DPDTTP molecules on an ordered Au(111) electrode in 0.1 M HClO4, H2SO4, and HCl. DPDTTP molecules were found to irreversibly adsorbed onto the Au electrode from a 10 μM dosing solution. Molecular-resolution STM images were obtained to reveal their spatial structure as functions of the chemical identity of the supporting electrolyte, the atomic structure of the Au(111) substrate, and the potential control. Only the reconstructed Au(111) electrode afforded ordered DPDTTP adlattices between -0.1 and 0.4 V (vs Ag/AgCl) in HClO4and H2SO4, and the DPDTTP adlayer became more compact with more positive potential. In 0.1 M HCl, pre-adsorbed DPDTTP molecules on the Au(111) electrode were displaced by chloride anions at E > 0.2 V, as evidenced by a well-ordered hexagonal array with a nearest-neighbor spacing of 3.8 ± 0.1 Å. The DPDTTP admolecule desorbed at E < -0.1 V in all acids. High-quality STM images were acquired to reveal two kinds of molecular conformations, as also found in the bulk single crystal of DPDTTP.
AB - The 2,3-diphenyl-5,7-di(thiophen-2-yl)thieno[3,4-b]pyrazine (DPDTTP) molecule is an organic molecule that is often used to produce photovoltaics and light-emitting diodes. The orientation of an organic semiconductor molecule at the metallic interface can affect the charge injection efficiency. The current study employed in situ scanning tunneling microscopy (STM) to examine the adsorption orientation of DPDTTP molecules on an ordered Au(111) electrode in 0.1 M HClO4, H2SO4, and HCl. DPDTTP molecules were found to irreversibly adsorbed onto the Au electrode from a 10 μM dosing solution. Molecular-resolution STM images were obtained to reveal their spatial structure as functions of the chemical identity of the supporting electrolyte, the atomic structure of the Au(111) substrate, and the potential control. Only the reconstructed Au(111) electrode afforded ordered DPDTTP adlattices between -0.1 and 0.4 V (vs Ag/AgCl) in HClO4and H2SO4, and the DPDTTP adlayer became more compact with more positive potential. In 0.1 M HCl, pre-adsorbed DPDTTP molecules on the Au(111) electrode were displaced by chloride anions at E > 0.2 V, as evidenced by a well-ordered hexagonal array with a nearest-neighbor spacing of 3.8 ± 0.1 Å. The DPDTTP admolecule desorbed at E < -0.1 V in all acids. High-quality STM images were acquired to reveal two kinds of molecular conformations, as also found in the bulk single crystal of DPDTTP.
UR - http://www.scopus.com/inward/record.url?scp=85136492095&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.2c03693
DO - 10.1021/acs.jpcc.2c03693
M3 - 期刊論文
AN - SCOPUS:85136492095
SN - 1932-7447
VL - 126
SP - 12906
EP - 12915
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 30
ER -