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- 저자 : Haenen, Ken (검색결과 2 건)
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Microwave cavity perturbation of nitrogen doped nano-crystalline diamond films
Cuenca, Jerome A.,Sankaran, Kamatchi Jothiramalingam,Pobedinskas, Paulius,Panda, Kalpataru,Lin, I-Nan,Porch, Adrian,Haenen, Ken,Williams, Oliver A. Elsevier 2019 Carbon Vol.145 No.-
<P><B>Abstract</B></P> <P>Non-contact and non-destructive electrical conductivity measurements of nitrogen doped nano-crystalline diamond films have been demonstrated using a microwave cavity perturbation system. The conductivity of the films was controlled by simply varying the CH<SUB>4</SUB> gas concentration during microwave plasma assisted chemical vapour deposition, thereby promoting the formation of sp<SUP>2</SUP> carbon at the grain boundaries. The presence of sp<SUP>2</SUP> carbon is verified through Raman spectroscopy, x-ray photoelectron spectroscopy and electron energy loss spectroscopy, while scanning electron microscopy confirms an increasing surface area for sp<SUP>2</SUP> to form. The microwave cavity perturbation results show that the measured cavity quality factor varies with CH<SUB>4</SUB> concentration. The extraction of conductivity is achieved through a depolarisation model, which must be considered when the sample is smaller than the cavity and through both electric and magnetic field perturbations. The microwave measurements are comparable to contacting and damaging measurements when the film conductivity is greater than the substrate, thus demonstrating an invaluable method for determining conductivity without the need for depositing any electrodes on the film.</P>
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Rani, Revati,Panda, Kalpataru,Kumar, Niranjan,Sankaran, Kamatchi Jothiramalingam,Pandian, Ramanathaswamy,Ficek, Mateusz,Bogdanowicz, Robert,Haenen, Ken,Lin, I-Nan American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.1
<P>Tribological properties of ultrananocrystalline diamond nanowall (UNCD NW) films were investigated quantitatively in three different and controlled triboenvironmental conditions, proposing the passivation and graphitization mechanisms. However, these mechanisms are rather complicated and possibly can be understood in well-controlled tribological conditions. It was shown that the friction and wear of these films were high in high-vacuum and room temperature (HV–RT) tribo conditions where the passivation of carbon dangling bonds were restricted and frictional shear-induced transformation of sp<SUP>3</SUP> carbon into amorphous carbon (a-C) and tetrahedral amorphous carbon (t-aC) were noticed. However, the friction coefficients were reduced to the ultralow value in ambient atmospheric and room temperature (AA–RT) tribo conditions. Here, both passivation of dangling bonds through atmospheric water vapor and graphitization of the contact interfaces were energetically favorable mechanisms. Furthermore, the conversion of diamond sp<SUP>3</SUP> into hydrogenated–graphitized phase was the dominating mechanism for the observed superlow friction coefficient and ultrahigh wear resistance of films in high-vacuum and high temperature (HV–HT) tribo conditions. These mechanisms were comprehensively investigated by micro-Raman and X-ray photoelectron spectroscopy analyses of the sliding interfaces.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2018/jpccck.2018.122.issue-1/acs.jpcc.7b10992/production/images/medium/jp-2017-10992p_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp7b10992'>ACS Electronic Supporting Info</A></P>
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