Using a parameter obtained from infrared measurements of the silicon-hydrogen stretch mode, the amout of light-induced degradation in hydrogenated amorphous silicon (a-Si:H) has been explored as a function of the amount of microstructure present in our samples. We find that samples with more microstructure, and also more bonded hydrogen, show an increased light-induced effect. At the same time, the volume density of states in the initial (annealed) state remains virtually unchanged. We discuss how the present results relate to existing models proposed to describe the light-induced effect.
Self-assembled monolayer (SAM) of n-alkanethiols of different chain lengths (n ¼ 2, 3, 6, 11, 16) on a gold surface are used to immobilize antibodies which in turn bind to a antigen. The antibody and antigen used in this study have similar molecular weights i.e. $150 kDa. The antibody [1.5 mg cm À2 ] immobilized varied with the surface packing density of the SAM of carboxylic acid-terminated n-alkanethiols of different lengths. In comparison, the efficiency of antibody immobilization was lowest on the loosely packed SAM of n-alkanethiols (n # 3) and the highest on the densely packed SAM of n-alkanethiols (n $ 11). However, increased immobilization of antibodies with increasing chain length of the n-alkanethiols [n > 11], did not result in a corresponding increase in antigen binding. An attempt to explain this phenomenon based on packing density and an orientation of the captured antibody is presented.www.rsc.org/advances 80480 | RSC Adv., 2015, 5, 80480-80487This journal is
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