108 research outputs found
High Performance X-Ray Transmission Windows Based on Graphenic Carbon
A novel x-ray transmission window based on graphenic carbon has been
developed with superior performance compared to beryllium transmission windows
that are currently used in the field. Graphenic carbon in combination with an
integrated silicon frame allows for a window design which does not use a
mechanical support grid or additional light blocking layers. Compared to
beryllium, the novel x-ray transmission window exhibits an improved
transmission in the low energy region ( ) while
demonstrating excellent mechanical stability, as well as light and vacuum
tightness. Therefore, the newly established graphenic carbon window, can
replace beryllium in x-ray transmission windows with a nontoxic and abundant
material. Index terms: Beryllium, Carbon, Graphene, Thin films, X-ray
applications, X-ray detector
Sub 20 nm Short Channel Carbon Nanotube Transistors
Carbon nanotube field-effect transistors with sub 20 nm long channels and
on/off current ratios of > 1000000 are demonstrated. Individual single-walled
carbon nanotubes with diameters ranging from 0.7 nm to 1.1 nm grown from
structured catalytic islands using chemical vapor deposition at 700 degree
Celsius form the channels. Electron beam lithography and a combination of HSQ,
calix[6]arene and PMMA e-beam resists were used to structure the short channels
and source and drain regions. The nanotube transistors display on-currents in
excess of 15 microA for drain-source biases of only 0.4 Volt.Comment: Nano Letters in pres
- …