Nanoindentation testing on copper/diamond-like carbon bi-layer films

In the present work, the effect of indentation load on nano-mechanical properties of copper/diamond-like carbon (Cu/DLC) bi-layer films was explored. In addition, effect of Cu interlayer and influence of self bias on residual stress and various other nano-mechanical properties such as hardness (H) and elastic modulus (E) of Cu/DLC bi-layer films were also discussed. These Cu/DLC bi-layer films were deposited, using hybrid system involving radio frequency (RF)-plasma enhanced chemical vapor deposition and RF-sputtering units, under varied self biases from −125 to −225 V. The effect of penetration depth with varied load from 5 to 20 mN on H and E of these Cu/DLC bi-layer films was also analyzed.     

Investigation of carrier scattering mechanisms in molybdenum diselenide single crystals by hall effect measurements

Molybdenum diselenide (MoSe₂) belong to the large family of layered transition metal dichalcogenides. It consists of weakly coupled sandwiched layers i.e. Se – Mo – Se in which a Mo atom layer is enclosed within two Se layers. This structure makes MoSe₂ extremely anisotropic in character and leads to unusual structural properties. In addition, MoSe₂ possess flexible nature along with good carrier mobility to make them potential candidate for fabricating flexible high mobility electronic devices such as Schottky barrier devices, FETs, solar cell etc. In context of this authors made an effort to study the low temperature (12 < T < 300 K) electronic transport properties of Molybdenum diselenide (MoSe₂). Through the investigation the temperature dependent Hall mobility study revealed that the grown crystals of MoSe₂possess a mixed scattering mechanism. It has been found that observed temperature dependant mobility has at least two transitions from lattice to impurity scatterings showing an imprint of multicarrier nature of this semiconductor originating from its complex band structure. It has been observed that the studied crystals have at least two group of carriers of differing origins in which transition between dominant scattering mechanisms occur at different temperatures. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

ChemInform Abstract: Magnetooptical Properties of Transition Metal Compounds XPt3 (X: V,Cr, Mn,Fe, Co) and X3Pt (X: Fe,Co)

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

Thin film order of symmetric diblock copolymers

The ordering in thin films of symmetric diblock copolymers of polystyrene and poly(methyl methacrylate) has been investigated by neutron reflectivity as a function of film thickness and temperature. The order-disorder transition in the thin films was found to lose its first order character in that the transition occurs in a continuous manner without the correlation length becoming infinite. In addition, a transition from a partially to fully ordered state was observed which was fully reversible. This transition depended in a power law manner on the film thickness and extrapolates to the bulk order-disorder transition temperature for thick films.