期刊
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
卷 5, 期 -, 页码 26-35出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.5.3
关键词
liquid AFM; multidentate; nanografting; nanolithography; self-assembly
资金
- National Science Foundation [DMR-0906873, DMR-0906727]
- American Chemical Society Petroleum Research Fund New Directions Program
- Camille Dreyfus Teacher-Scholar award
- Robert A. Welch Foundation [E-1320]
- Texas Center for Superconductivity at the University of Houston
The solution self-assembly of multidentate organothiols onto Au(111) was studied in situ using scanning probe nanolithography and time-lapse atomic force microscopy (AFM). Self-assembled monolayers (SAMs) prepared from dilute solutions of multidentate thiols were found to assemble slowly, requiring more than six hours to generate films. A clean gold substrate was first imaged in ethanolic media using liquid AFM. Next, a 0.01 mM solution of multidentate thiol was injected into the liquid cell. As time progressed, molecular-level details of the surface changes at different time intervals were captured by successive AFM images. Scanning probe based nanofabrication was accomplished using protocols of nanografting and nanoshaving with n-alkanethiols and a tridentate molecule, 1,1,1-tris(mercaptomethyl) heptadecane (TMMH). Nanografted patterns of TMMH could be inscribed within n-alkanethiol SAMs; however, the molecular packing of the nanopatterns was less homogeneous compared to nanopatterns produced with monothiolates. The multidentate molecules have a more complex assembly pathway than monothiol counterparts, mediated by sequential steps of forming S-Au bonds to the substrate.
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