TY - JOUR
T1 - Solvent-dependent assembly of terphenyl- And quaterphenyldithiol on gold and gallium arsenide
AU - Krapchetov, Dmitry A.
AU - Ma, Hong
AU - Jen, Alex K.Y.
AU - Fischer, Daniel A.
AU - Loo, Yueh-Lin
PY - 2005/6/21
Y1 - 2005/6/21
N2 - The assembly of terphenyldithiol (TPDT) and quaterphenyldithiol (QPDT) on gold and gallium arsenide from ethanol (EtOH), tetrahydrofuran (THF), and solutions consisting of both solvents has been characterized by near-edge X-ray absorption fine structure spectroscopy. The surface coverage and the average orientation of both TPDT and QPDT on gold are solvent-independent. These molecules readily form monolayers on gold with an ensemble-average backbone tilt of 30°±3° from the substrate normal. In sharp contrast, the assembly of TPDT and QPDT on gallium arsenide is extremely solvent-sensitive. At high ethanol fractions, both molecules form monolayers with an ensemble-average orientation that is indistinguishable from those on gold substrates. At low ethanol fractions and in pure THF, however, these molecules are disordered on gallium arsenide and the surface coverage is poor. © 2005 American Chemical Society.
AB - The assembly of terphenyldithiol (TPDT) and quaterphenyldithiol (QPDT) on gold and gallium arsenide from ethanol (EtOH), tetrahydrofuran (THF), and solutions consisting of both solvents has been characterized by near-edge X-ray absorption fine structure spectroscopy. The surface coverage and the average orientation of both TPDT and QPDT on gold are solvent-independent. These molecules readily form monolayers on gold with an ensemble-average backbone tilt of 30°±3° from the substrate normal. In sharp contrast, the assembly of TPDT and QPDT on gallium arsenide is extremely solvent-sensitive. At high ethanol fractions, both molecules form monolayers with an ensemble-average orientation that is indistinguishable from those on gold substrates. At low ethanol fractions and in pure THF, however, these molecules are disordered on gallium arsenide and the surface coverage is poor. © 2005 American Chemical Society.
UR - http://www.scopus.com/inward/record.url?scp=21744438581&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-21744438581&origin=recordpage
U2 - 10.1021/la0503000
DO - 10.1021/la0503000
M3 - RGC 21 - Publication in refereed journal
SN - 0743-7463
VL - 21
SP - 5887
EP - 5893
JO - Langmuir
JF - Langmuir
IS - 13
ER -