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Properties of Ultra Fast Deposited Diamond-Like Hydrogenated Carbon Films

100%

Sullivan J., Saied S., Zaharia T.

Acta Physica Polonica A

2011

vol. 120

issue 1

156-162

Hydrogenated amorphous carbon films with diamond like structures have been formed on different substrates at very low energies and temperatures by a plasma enhanced chemical vapor deposition process employing acetylene as the precursor gas. The plasma source was of a cascaded arc type with Ar as carrier gas. The films were grown at very high deposition rates. Deposition on Si, glass and plastic substrates has been studied and the films characterized in terms of sp^3 content, roughness, hardness, adhesion and optical properties. Deposition rates up to 20 nm/s have been achieved at substrate temperatures below 100°C. The typical sp^3 content of 60-75% in the films was determined by X-ray generated Auger electron spectroscopy. Hardness, reduced modulus and adhesion were measured using a MicroMaterials Nano Test Indenter/Scratch tester. Hardness was found to vary from 4 to 13 GPa depending on deposition conditions. Adhesion was significantly influenced by the substrate temperature and in situ DC cleaning. Hydrogen content in the film was measured by a combination of the Fourier transform infrared and Rutherford backscattering techniques. Advantages of these films are: low ion energy and deposition temperature, very high deposition rates, low capital cost of the equipment and the possibility of film properties being tailored according to the desired application.

Bivalve Characterization Using Synchrotron Micro X-Ray Fluorescence

40%

Jones K., Bronson S., Brink P., Gordon C., Mosher-Smith K., Brown M., Chaudhry S., Rizzo A., Sigismondi R., Whitehurst M., Lukaszewski A., Kranz D., Bland K., Gordan D., Lobel J., Sullivan J., Metzger M., O'Shea C., Harris C., Arezzo R., Kambhampati M.

Acta Physica Polonica A

2009

vol. 115

issue 2

477-481

Bivalves, oysters, mussels, and clams are important constituents of riverine and estuarine ecosystems. Their shells and soft tissues provide information on the environments in which they live. Since they are filter feeders, they also are factors in improving water quality through removal of particulate matter from the water column. Finally, they are a valuable food source that has substantial economic value. Hence, characterization of shells and soft tissues is useful for improved understanding of these factors. Here, we used X-ray microprobes and computed microtomography facilities at the Brookhaven National Synchrotron Light Source to investigate elemental distributions in bivalves taken from locations around New York, Washington, DC, and New Orleans, LA. The results form the initial basis for compilation of a database of relevant parameters that can serve for tracking environmental changes and for assessing toxicity of particular metals. The work was enabled by active collaboration with students from the several regions, community groups, and research scientists. The collaboration was facilitated through use of web conferencing between Brookhaven National Laboratory and the varied locations.

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2 Acta Physica Polonica A

1 2011

1 2009

2 Sullivan J.

1 Arezzo R.

1 Bland K.

1 Brink P.

1 Bronson S.

1 Brown M.

1 Chaudhry S.

1 Gordan D.

1 Gordon C.

1 Harris C.

1 Jones K.

1 Kambhampati M.

1 Kranz D.

1 Lobel J.

1 Lukaszewski A.

1 Metzger M.

1 Mosher-Smith K.

1 O'Shea C.

1 Rizzo A.

1 Saied S.

1 Sigismondi R.

1 Whitehurst M.

1 Zaharia T.

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Properties of Ultra Fast Deposited Diamond-Like Hydrogenated Carbon Films

Bivalve Characterization Using Synchrotron Micro X-Ray Fluorescence