| Project/Area Number |
12490012
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
広領域
|
|---|
| Research Institution | Tokyo University of Agriculture and Technology |
|---|
Principal Investigator |
OZAKI Hiroyuki Tokyo University of Agriculture and Technology, Faculty of Technology, Associate Professor, 工学部, 助教授 (40204185)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SONOYAMA Masashi Tokyo University of Agriculture and Technology, Faculty of Technology, Research Associate, 工学部, 助手 (40242242)
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Project Status |
Completed (Fiscal Year 2002)
|
| Budget Amount *help |
¥14,400,000 (Direct Cost: ¥14,400,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2000: ¥12,800,000 (Direct Cost: ¥12,800,000)
|
|---|
| Keywords | organic monatomic layer / alkadiyne / atomic sash / monolayer polymerization / scanning tunneling microscopy / Penning ionization electron spectroscopy / ultraviolet photoelectron spectroscopy / infrared reflection absorption spectroscopy / 反応性鎖状分子 / 蒸着単分子層 / 反応性鎖状化合物 / 層状物質 / 二次元有機物単一層 / ぺニングイオン化電子分光 |
|---|
| Research Abstract |
1.To investigate the formation, geometrical and electronic structures, and the properties of monolayers comprising reactive molecules or networked carbon atoms laid flat on solid surfaces as well as the piled-up layers, we have developed a low-temperature scanning tunneling microscope which can be connected to our photo-and Penning electron spectrometer. We have obtained the following conclusions on the monolayers of alkadiyne or sashlike polydiacetylene (PD), atomic sash (AS) prepared on graphite (0001) surfaces. In a monomer monolayer prepared by evaporation onto a substrate held at room temperature, molecules form large (1000Å) domains with column structure although they are, liable to be desorbed, while they provide small ones at low temperature. When a monolayer prepared at 150 K is annealed at 220 K, molecules obtain suitable mobility for monolayer polymerization, loosing the column structure. when irradiated with UV light at 220 K, the molecules are transformed into AS-I in a lo
… More
w temperature phase having raised" PD chains orthogonal to alkyl chains with gauche conformation at f3-y methylenes. Heating the AS-I to room temperature yields A S-II in a high temperature phase ; the alkyl and PD chains intersect at ca. 70゜ and are maintained in a common plane.On cooling, the AS-II is transformed back to the AS-I. Furthermore, there are two kinds 'of AS-II with different molecule-substrate commensurations. In addition, the phase transition and deformation of a single PD chain can be induced by an STM tip.
2.We carried out infrared reflection absorption spectroscopy for alkadiyne on Au(111) and found that all-trans molecules are laid flat with a column structure as in a vapor-deposited monolayer on graphite if the monolayer is prepared by adsorption from a solution. Transformation to AS is now under investgation.
3.We have developed a program to synthesize the Penning ionization electron spectra of solid phase molecules theoretically for expected molecular orientation and arrangement. The flat-on and tilted-on orientation were verified for the mono-and multilayers of long chain molecules on graphite, respectively, by comparing the synthesized and observed spectra. Less
|
