Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C14TAB Nanoparticles: Structure and Stability
The vibrational spectra of platinum nanoparticles (12 nm) capped with tetradecyltrimethylammonium bromide, C14TAB, were investigated by Fourier transform infrared (FTIR) spectroscopy. We have shown that the thermal decay of Pt−C14TAB nanoparticles in N2, H2, and O2 atmospheres leads to the release o...
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| Veröffentlicht in: | Langmuir 2009-06, Vol.25 (12), p.6665-6671 |
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| creator | Borodko, Yuri Jones, Louis Lee, Hyunjoo Frei, Heinz Somorjai, Gabor |
| description | The vibrational spectra of platinum nanoparticles (12 nm) capped with tetradecyltrimethylammonium bromide, C14TAB, were investigated by Fourier transform infrared (FTIR) spectroscopy. We have shown that the thermal decay of Pt−C14TAB nanoparticles in N2, H2, and O2 atmospheres leads to the release of the hydrocarbon chain of the surfactant and the formation of a strongly bonded layer of ammonium cations on the platinum surface. The platinum atoms accessible to CO chemisorption were not reducible by hydrogen in the temperature range from 30 to 200 °C. A FTIR spectrum of C14TAB adsorbed on Pt nanoparticles was dramatically perturbed as compared with pure C14TAB. New intense and broad bands centered at 1450 cm−1 and 760 cm−1 are making their appearance in Pt−C14TAB. It may be speculated that new bands are the result of coupling between conducting electrons of Pt and molecular vibrations of adsorbed C14TAB, and as a consequence, specific vibrational modes of ammonium cation are transformed into electron-vibrational modes. |
| doi_str_mv | 10.1021/la803406p |
| format | Article |
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(LBNL), Berkeley, CA (United States)</creatorcontrib><description>The vibrational spectra of platinum nanoparticles (12 nm) capped with tetradecyltrimethylammonium bromide, C14TAB, were investigated by Fourier transform infrared (FTIR) spectroscopy. We have shown that the thermal decay of Pt−C14TAB nanoparticles in N2, H2, and O2 atmospheres leads to the release of the hydrocarbon chain of the surfactant and the formation of a strongly bonded layer of ammonium cations on the platinum surface. The platinum atoms accessible to CO chemisorption were not reducible by hydrogen in the temperature range from 30 to 200 °C. A FTIR spectrum of C14TAB adsorbed on Pt nanoparticles was dramatically perturbed as compared with pure C14TAB. New intense and broad bands centered at 1450 cm−1 and 760 cm−1 are making their appearance in Pt−C14TAB. It may be speculated that new bands are the result of coupling between conducting electrons of Pt and molecular vibrations of adsorbed C14TAB, and as a consequence, specific vibrational modes of ammonium cation are transformed into electron-vibrational modes.</description><identifier>ISSN: 0743-7463</identifier><identifier>EISSN: 1520-5827</identifier><identifier>DOI: 10.1021/la803406p</identifier><identifier>PMID: 19397251</identifier><identifier>CODEN: LANGD5</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>37 ; ATOMS ; BROMIDES ; CATIONS ; CHAINS ; Chemistry ; Colloidal state and disperse state ; Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams ; DECAY ; ELECTRONS ; Exact sciences and technology ; General and physical chemistry ; HYDROCARBONS ; HYDROGEN ; Metal Nanoparticles ; Microscopy, Electron ; Molecular Structure ; Physical and chemical studies. Granulometry. Electrokinetic phenomena ; PLATINUM ; SPECTRA ; SPECTROSCOPY ; Spectroscopy, Fourier Transform Infrared ; STABILITY ; Surface physical chemistry ; SURFACTANTS ; Temperature ; Trimethyl Ammonium Compounds - chemistry</subject><ispartof>Langmuir, 2009-06, Vol.25 (12), p.6665-6671</ispartof><rights>Copyright © 2009 American Chemical Society</rights><rights>2009 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/la803406p$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/la803406p$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>230,314,776,780,881,27055,27903,27904,56717,56767</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21590352$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/19397251$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/servlets/purl/983015$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Borodko, Yuri</creatorcontrib><creatorcontrib>Jones, Louis</creatorcontrib><creatorcontrib>Lee, Hyunjoo</creatorcontrib><creatorcontrib>Frei, Heinz</creatorcontrib><creatorcontrib>Somorjai, Gabor</creatorcontrib><creatorcontrib>Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)</creatorcontrib><title>Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C14TAB Nanoparticles: Structure and Stability</title><title>Langmuir</title><addtitle>Langmuir</addtitle><description>The vibrational spectra of platinum nanoparticles (12 nm) capped with tetradecyltrimethylammonium bromide, C14TAB, were investigated by Fourier transform infrared (FTIR) spectroscopy. We have shown that the thermal decay of Pt−C14TAB nanoparticles in N2, H2, and O2 atmospheres leads to the release of the hydrocarbon chain of the surfactant and the formation of a strongly bonded layer of ammonium cations on the platinum surface. The platinum atoms accessible to CO chemisorption were not reducible by hydrogen in the temperature range from 30 to 200 °C. A FTIR spectrum of C14TAB adsorbed on Pt nanoparticles was dramatically perturbed as compared with pure C14TAB. New intense and broad bands centered at 1450 cm−1 and 760 cm−1 are making their appearance in Pt−C14TAB. It may be speculated that new bands are the result of coupling between conducting electrons of Pt and molecular vibrations of adsorbed C14TAB, and as a consequence, specific vibrational modes of ammonium cation are transformed into electron-vibrational modes.</description><subject>37</subject><subject>ATOMS</subject><subject>BROMIDES</subject><subject>CATIONS</subject><subject>CHAINS</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams</subject><subject>DECAY</subject><subject>ELECTRONS</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>HYDROCARBONS</subject><subject>HYDROGEN</subject><subject>Metal Nanoparticles</subject><subject>Microscopy, Electron</subject><subject>Molecular Structure</subject><subject>Physical and chemical studies. Granulometry. 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Granulometry. Electrokinetic phenomena</topic><topic>PLATINUM</topic><topic>SPECTRA</topic><topic>SPECTROSCOPY</topic><topic>Spectroscopy, Fourier Transform Infrared</topic><topic>STABILITY</topic><topic>Surface physical chemistry</topic><topic>SURFACTANTS</topic><topic>Temperature</topic><topic>Trimethyl Ammonium Compounds - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Borodko, Yuri</creatorcontrib><creatorcontrib>Jones, Louis</creatorcontrib><creatorcontrib>Lee, Hyunjoo</creatorcontrib><creatorcontrib>Frei, Heinz</creatorcontrib><creatorcontrib>Somorjai, Gabor</creatorcontrib><creatorcontrib>Lawrence Berkeley National Lab. 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(LBNL), Berkeley, CA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C14TAB Nanoparticles: Structure and Stability</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2009-06-16</date><risdate>2009</risdate><volume>25</volume><issue>12</issue><spage>6665</spage><epage>6671</epage><pages>6665-6671</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>The vibrational spectra of platinum nanoparticles (12 nm) capped with tetradecyltrimethylammonium bromide, C14TAB, were investigated by Fourier transform infrared (FTIR) spectroscopy. We have shown that the thermal decay of Pt−C14TAB nanoparticles in N2, H2, and O2 atmospheres leads to the release of the hydrocarbon chain of the surfactant and the formation of a strongly bonded layer of ammonium cations on the platinum surface. The platinum atoms accessible to CO chemisorption were not reducible by hydrogen in the temperature range from 30 to 200 °C. A FTIR spectrum of C14TAB adsorbed on Pt nanoparticles was dramatically perturbed as compared with pure C14TAB. New intense and broad bands centered at 1450 cm−1 and 760 cm−1 are making their appearance in Pt−C14TAB. It may be speculated that new bands are the result of coupling between conducting electrons of Pt and molecular vibrations of adsorbed C14TAB, and as a consequence, specific vibrational modes of ammonium cation are transformed into electron-vibrational modes.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>19397251</pmid><doi>10.1021/la803406p</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | 37 ATOMS BROMIDES CATIONS CHAINS Chemistry Colloidal state and disperse state Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams DECAY ELECTRONS Exact sciences and technology General and physical chemistry HYDROCARBONS HYDROGEN Metal Nanoparticles Microscopy, Electron Molecular Structure Physical and chemical studies. Granulometry. Electrokinetic phenomena PLATINUM SPECTRA SPECTROSCOPY Spectroscopy, Fourier Transform Infrared STABILITY Surface physical chemistry SURFACTANTS Temperature Trimethyl Ammonium Compounds - chemistry |
| title | Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C14TAB Nanoparticles: Structure and Stability |
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