Jaroslav Bohacek

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Four different carboranethiol derivatives were used to modify the surfaces of gold nanoparticles and flat gold films. The novel materials engendered from these modifications are extraordinarily stable species with surfaces that support self-assembled monolayers of 1-(HS)-1,2-C2B10H11, 1,2-(HS)2-1,2-C2B10H10, 1,12-(HS)2-1,12-C2B10H10, and(More)
Ab st ra c t – A 10 Ω quadrifilar resistor with calculable frequency dependence served as a reference in measurement of frequency dependences of resistance standards ranging from 1 Ω to 0.01 Ω in a frequency range up to 10 kHz. In this measurement, a step-down method based on successive 10:1 comparisons of the standards by means of a transformer bridge was(More)
A set of resistance standards ranging from 100 Ω to 10 000 Ω and applicable to calibrations of wideband LCR meters has been prepared using surface mount metal foil resistors. Frequency dependences of these standards have been evaluated by comparing them with resistors having calculable frequency performance.
 Four terminal-pair coaxial capacitance standards with nominal values of 1 pF and 10 pF have been realized and, using a uniform transmission line model, their frequency dependences have been evaluated. 1:1 comparisons against reference capacitors with known frequency dependence (Agilent 16381A and Agilent 16382A) have shown that the values of the 1 pF and(More)
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