High-Sensitivity Transmission IR Spectroscopy for the Chemical Identification and Structural Analysis of Conjugated Molecules on Gallium Arsenide Surfaces
We demonstrate the use of high-sensitivity, off-normal transmission IR spectroscopy with s-polarized light to probe the chemical identity and orientation of quaterphenyldithiol (QPDT) molecular assemblies on GaAs as a function of ammonium hydroxide (NH4OH) concentration. NH4OH is added to the assemb...
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| Veröffentlicht in: | Langmuir 2006-11, Vol.22 (23), p.9491-9494 |
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| creator | Krapchetov, Dmitry A Ma, Hong Jen, Alex K. Y Fischer, Daniel A Loo, Yueh-Lin |
| description | We demonstrate the use of high-sensitivity, off-normal transmission IR spectroscopy with s-polarized light to probe the chemical identity and orientation of quaterphenyldithiol (QPDT) molecular assemblies on GaAs as a function of ammonium hydroxide (NH4OH) concentration. NH4OH is added to the assembly solution to convert the thioacetyl groups on the QPDT precursor to thiolates. When assembled at high NH4OH concentrations, the acetyl groups are completely removed, and QPDT is disordered on GaAs. Assembly at low NH4OH concentrations, however, results in QPDT assemblies that are preferentially upright. The molecular orientation is further quantified with near-edge X-ray absorption fine structure spectroscopy. |
| doi_str_mv | 10.1021/la0623984 |
| format | Article |
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Assembly at low NH4OH concentrations, however, results in QPDT assemblies that are preferentially upright. The molecular orientation is further quantified with near-edge X-ray absorption fine structure spectroscopy.</description><subject>CHEMICAL ANALYSIS</subject><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>GALLIUM ARSENIDES</subject><subject>General and physical chemistry</subject><subject>INFRARED SPECTRA</subject><subject>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</subject><subject>national synchrotron light source</subject><subject>ORIENTATION</subject><subject>SURFACE PROPERTIES</subject><subject>THIOLS</subject><issn>0743-7463</issn><issn>1520-5827</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNptkc-O0zAQxiMEYrsLB14AmQMrcQjYsRMnx6qC3UrLH9EiJC6Wa0-2LqldPA6ir8LT4qrV9sLJ9szPn2a-ryheMPqW0Yq9GzRtKt614lExYXVFy7qt5ONiQqXgpRQNvyguETeU0o6L7mlxwSSVXDTdpPh76-7X5QI8uuR-u7Qny6g9bh2iC57Mv5LFDkyKAU3Y7UkfIklrILM1bJ3RA5lb8Mn1-Z4OvPaWLFIcTRpj7k69HvbokISezILfjPc6gSUfwwBmHCDXPbnRw-DGLZlGBO8skMUYe20AnxVPej0gPD-dV8W3D--Xs9vy7vPNfDa9K7WgMpW847W2rWw1XTFraC3lSgrgkq-0YXTV2gp0ld-NtV0PVvOqzmaxWvT5ZwP8qnh11A2YnELjEpi1Cd7nvVXHKWtkZq6PzC6GXyNgUtkhA8OgPYQRVdNRJrumy-CbI2iyZRihV7votjruFaPqEJZ6CCuzL0-i42oL9kye0snA6xOgMZvd52SMwzPXVrWQ4sCVR85hgj8PfR1_qjy7rNXyy0J9Et-rmjWt-nHW1QbVJowxx4T_GfAf3-C5IA</recordid><startdate>20061107</startdate><enddate>20061107</enddate><creator>Krapchetov, Dmitry A</creator><creator>Ma, Hong</creator><creator>Jen, Alex K. 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Y</creatorcontrib><creatorcontrib>Fischer, Daniel A</creatorcontrib><creatorcontrib>Loo, Yueh-Lin</creatorcontrib><creatorcontrib>Brookhaven National Laboratory (BNL) National Synchrotron Light Source</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Krapchetov, Dmitry A</au><au>Ma, Hong</au><au>Jen, Alex K. Y</au><au>Fischer, Daniel A</au><au>Loo, Yueh-Lin</au><aucorp>Brookhaven National Laboratory (BNL) National Synchrotron Light Source</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High-Sensitivity Transmission IR Spectroscopy for the Chemical Identification and Structural Analysis of Conjugated Molecules on Gallium Arsenide Surfaces</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2006-11-07</date><risdate>2006</risdate><volume>22</volume><issue>23</issue><spage>9491</spage><epage>9494</epage><pages>9491-9494</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>We demonstrate the use of high-sensitivity, off-normal transmission IR spectroscopy with s-polarized light to probe the chemical identity and orientation of quaterphenyldithiol (QPDT) molecular assemblies on GaAs as a function of ammonium hydroxide (NH4OH) concentration. NH4OH is added to the assembly solution to convert the thioacetyl groups on the QPDT precursor to thiolates. When assembled at high NH4OH concentrations, the acetyl groups are completely removed, and QPDT is disordered on GaAs. Assembly at low NH4OH concentrations, however, results in QPDT assemblies that are preferentially upright. The molecular orientation is further quantified with near-edge X-ray absorption fine structure spectroscopy.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>17073469</pmid><doi>10.1021/la0623984</doi><tpages>4</tpages></addata></record> |
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| subjects | CHEMICAL ANALYSIS Chemistry Exact sciences and technology GALLIUM ARSENIDES General and physical chemistry INFRARED SPECTRA INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY national synchrotron light source ORIENTATION SURFACE PROPERTIES THIOLS |
| title | High-Sensitivity Transmission IR Spectroscopy for the Chemical Identification and Structural Analysis of Conjugated Molecules on Gallium Arsenide Surfaces |
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