Abstract:Recent advances in the control of thin films and surfaces have brought an intriguing question within reach: Is it possible to tailor the electronic properties of solids by controlling them layer by layer or row by row? Customized molecules are commonplace in biochemistry. Can the same idea be brought to bear on solids and electronic materials? Electronic properties of semiconductor devices have been controlled by hetero-structures, quantum wells, and super-lattices. Magnetism as a cooperative phenomenon lends … Show more
“…Stepped Si͑111͒ templates have been prepared with high perfection by appropriate annealing sequences. [29][30][31] At low enough coverage there is only a single gold chain in the unit cell of such vicinal surfaces, while the flat Si(111)5 ϫ2-Au structure consists of two Au chains per unit cell. 32 Figure 1 shows how vicinal Si͑111͒ surfaces containing the stable ͓1 1 0͔ steps can be classified into two groups, one tilted with its normal towards the ͓1 1 2 ͔ azimuth with one broken bond at the step edge, the other towards ͓1 1 2͔ with two broken bonds.…”
Section: Structure Of Gold Chains On Stepped Si"111…mentioning
A combination of angle-resolved photoemission and scanning tunneling microscopy is used to explore the possibilities for tailoring the electronic structure of gold atom chains on silicon surfaces. It is shown that the interchain coupling and the band filling can be adjusted systematically by varying the step spacing via the tilt angle from Si͑111͒. Planes with odd Miller indices are stabilized by chains of gold atoms. Metallic bands and Fermi surfaces are observed. These findings suggest that atomic chains at stepped semiconductor substrates make a highly flexible class of solids approaching the one-dimensional limit.
“…Stepped Si͑111͒ templates have been prepared with high perfection by appropriate annealing sequences. [29][30][31] At low enough coverage there is only a single gold chain in the unit cell of such vicinal surfaces, while the flat Si(111)5 ϫ2-Au structure consists of two Au chains per unit cell. 32 Figure 1 shows how vicinal Si͑111͒ surfaces containing the stable ͓1 1 0͔ steps can be classified into two groups, one tilted with its normal towards the ͓1 1 2 ͔ azimuth with one broken bond at the step edge, the other towards ͓1 1 2͔ with two broken bonds.…”
Section: Structure Of Gold Chains On Stepped Si"111…mentioning
A combination of angle-resolved photoemission and scanning tunneling microscopy is used to explore the possibilities for tailoring the electronic structure of gold atom chains on silicon surfaces. It is shown that the interchain coupling and the band filling can be adjusted systematically by varying the step spacing via the tilt angle from Si͑111͒. Planes with odd Miller indices are stabilized by chains of gold atoms. Metallic bands and Fermi surfaces are observed. These findings suggest that atomic chains at stepped semiconductor substrates make a highly flexible class of solids approaching the one-dimensional limit.
“…They may form the basis of a new thin-film electronic technology, in which integrated transistor circuits are manufactured by cheap solution processing and direct printing rather than vacuum deposition and photolithographic patterning (3)(4)(5)(6) er, this requires the development of printing techniques that provide accurate definition of all components of an integrated circuit but do not compromise the ability of the organic molecules to self-assemble. Inkjet printing (IJP) has emerged as an attractive patterning technique for conjugated polymers in lightemitting diodes (7,8) and full-color highresolution displays (9).…”
Section: High-resolution Lnkjet Printing Of All-polymer Transistor CImentioning
Metallic molybdenum (Mo(o)) wires with diameters ranging from 15 nanometers to 1.0 micrometers and lengths of up to 500 micrometers (0.5 millimeters) were prepared in a two-step procedure. Molybdenum oxide wires were electrodeposited selectively at step edges and then reduced in hydrogen gas at 500 degrees C to yield Mo(o). The hemicylindrical wires prepared by this technique were self-uniform, and the wires prepared in a particular electrodeposition (in batches of 10(5) to 10(7)) were narrowly distributed in diameter. Wires were obtained size selectively because the mean wire diameter was directly proportional to the square root of the electrolysis time. The metal nanowires could be embedded in a polystyrene film and lifted off the graphite electrode surface. The conductivity and mechanical resiliency of individual embedded wires were similar to those of bulk molybdenum.
“…Decoration of step edges: At the step edges of single -crystalline surfaces, metals and other materials are deposited selectively with success [42,43] . This deposition procedure results in the generation of continuous nanowires.…”
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