nanocrystals tagged posts

Top: High-resolution electron microscopy images of a nickel silicide rhombic nanocrystal embedded in a silicon nanowire prepared with gold silicide used as a catalyst. The images demonstrate the intimate interactions that arise at the interfaces of these nanomaterials. Bottom: The physical properties that arise from such complex nano-systems could be used in next-generation photodetectors, lasers, and transistors.

Scientists have tailored extremely small wires that carry light and electrons which could open up a potential path to smaller, lighter, or more efficient devices. This development could lead to highly tailored nanowires for new classes of high-performance, energy-efficient computing, communications, and environmental and medical sensing systems...

Optically imaging of on-surface and suspended carbon nanotube devices.

Technion researchers have developed a method for growing carbon nanotubes that could lead to the day when molecular electronics replace silicon chip as the building block of electronics.Carbon nanotubes (CNTs) have long fascinated scientists because of their unprecedented electrical, optical, thermal and mechanical properties, and chemical sensitivity. But significant challenges remain before CNTs can be implemented on a wide scale, including the need to produce them in specific locations on a smooth substrate, in conditions that will lead to the formation of a circuit around them.

Prof. Yuval Yaish et al have developed a technology that addresses these challenges...

Charge carriers in polymeric carbon nitrides always take paths perpendicular to the sheets, as Merschjann’s group has now shown. Light creates an electron-hole pair. The opposite happens when an electron and hole meet under certain conditions (forming a singlet exciton) and emit light (fluorescence). Credit: C. Merschjann.

Polymeric carbon nitride is an organic material with interesting optoelectronic properties. As an inexpensive photocatalyst, it can be used to facilitate water splitting using sunlight. Research has now investigated for the 1st time how light creates charge carriers in this class of materials and established details about charge mobility and lifetimes...