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Evaluation of Friction Coefficient and Adhesion Properties of Silicon Carbon Nitride Films Prepared by HWCVD

100%

Yamada T., Iseda T., Kadotani Y., Izumi A.

Acta Physica Polonica A

2017

vol. 131

issue 3

463-466

We have investigated the friction-coefficient properties of silicon carbon nitride (SiCN) films deposited on stainless steel substrates and the adhesion properties of SiCN films deposited on Si(100). The SiCN films were deposited by hot-wire chemical vapor deposition using hexamethyldisilazane and ammonium. It was found that SiCN coating was able to effectively reduce the frictional coefficient of the stainless steel substrates. The adhesion strength was measured by surface-interface physical property analysis equipment (SAICAS) and was found to be 45 N/m for the as-deposited SiCN film on Si(100). Furthermore, a maximum adhesive strength of 92 N/m was obtained after treating the film for 10 min at 1000°C.

Variable Temperature STM/STS Investigations of Ag Nanoparticles Growth on Semiconductor Surfaces

64%

Suto S., Czajka R., Szuba S., Shiwa A., Winiarz S., Nagashima H., Kato H., Yamada T., Kasuya A.

Acta Physica Polonica A

2003

vol. 104

issue 3-4

289-302

We have investigated the growth of Ag nanoparticles deposited on Si(111), H/Si(111)-(1×1) and Bi_2Te_3 substrates using a variable temperature scanning tunneling microscopy. These substrates are different as regards the model system for cluster and islands growth at the nanometer scale. Ag was evaporated onto the sample mounted at the scanning tunneling microscopy stage in vacuum of 10^{-10} Torr range during evaporation. The substrates were kept at different temperatures: -150˚C, room temperature, and 300˚C during the deposition process. In general, we have observed 3D growth mode up to several ML coverage. The density of clusters and their size were functions of the substrate's temperature during the deposition process - a higher density and a smaller size at -150˚C were in opposition to the 300˚C results - a lower density and a larger size. Low temperature depositions led to continuous layers above 10 ML coverage but the surface was covered by small Ag clusters of 1-2 nm in heights and 2-3 nm in diameters. The log-log graphs of height and projected diameter of Ag clusters revealed different slopes indicating different growth mechanisms at low and high temperatures. We obtained the value of n=0.25±0.02, typical of the so-called droplet model of cluster growth, only at 300˚C. Scanning tunneling spectroscopy measurements revealed clearly different I-V (and dI/dV vs. bias voltage) curves measured above clusters and directly above the substrate. In discussion, we compared our results to theoretically calculated density of states from other papers, finding conformity for partial density of states.

Scanning Tunneling Spectroscopy Study of Surface States of 3d Metals: Chemical Identification, Magnetic Contrast and Orbital Kondo Resonance States

52%

Bischoff M., Fang C., de Groot R., Heijnen G., Katsnelson M., Kolesnychenko O., de Kort R., Lichtenstein A., Quinn A., Vasquez de Parma A., Yamada T., van Kempen H.

Acta Physica Polonica A

2003

vol. 104

issue 3-4

231-243

The surface states of 3d transition metals are studied by scanning tunneling microscopy and scanning tunneling spectroscopy. The results show that surface states can be used for chemical identification with high spatial resolution. The spin polarized nature of the surface states allows us to obtain magnetic contrast in scanning tunneling miroscopy imaging with near atomic resolution. For Cr(100) we found that the surface state close to the Fermi level can be explained by an orbital Kondo resonance surface state.

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3 Acta Physica Polonica A

1 2017

2 2003

3 Yamada T.

1 Bischoff M.

1 Czajka R.

1 Fang C.

1 Heijnen G.

1 Iseda T.

1 Izumi A.

1 Kadotani Y.

1 Kasuya A.

1 Kato H.

1 Katsnelson M.

1 Kolesnychenko O.

1 Lichtenstein A.

1 Nagashima H.

1 Quinn A.

1 Shiwa A.

1 Suto S.

1 Szuba S.

1 Vasquez de Parma A.

1 Winiarz S.

1 de Groot R.

1 de Kort R.

1 van Kempen H.

Search results

Evaluation of Friction Coefficient and Adhesion Properties of Silicon Carbon Nitride Films Prepared by HWCVD

Variable Temperature STM/STS Investigations of Ag Nanoparticles Growth on Semiconductor Surfaces

Scanning Tunneling Spectroscopy Study of Surface States of 3d Metals: Chemical Identification, Magnetic Contrast and Orbital Kondo Resonance States