Institutional research of nanoelectromagnetics

Pawan Kumar KHANNA

Applied Chemistry and Nanoscience, India

The high-end nanotechnology that essentially depends on excellent nano-chemistry, has prompted chemists to undertake new challenges, not only in synthesis but in tailoring desired optical properties for useful applications in electronics and optical devices. In recent years, Quantum dots have greatly influenced the fate of photonic devices and of late, their potential as sensitizers for replacing organic dyes in dye-sensitized solar cells and their conjugation with bio-molecules for bio-solar cells has attracted many researchers. Enhanced experimental skills of chemists are now playing major role in isolation of thermodynamically stable pre-mature ‘early-stage’ elongated nano-particles which upon isolation are termed as ‘Magic-number nano-crystals’. Because of their not-so-perfect crystal structure these magic-number NCs differ with QDs in their optical properties e.g. a doublet absorption and broad emission wavelength in compare to single narrow absorption and emission of QDs. The optical properties can be tuned either for magic-size NCs alone or a combination of with QDs and or can be converted to ofthat of pure QDs in case of CdSe. These high-end nano-crystals thus become potential candidate for white LEDs. QDs synthesis via organometallic reactions are often preferred but warrants special efforts. Alkeno-1,2,3-selenadiazoles are excellent Se-provider reasonably greener synthesis of magic-sized NCs as well as of regular metal selenides that includes CdSe. The high-end products/particles can be isolated with ease directly or via formation of molecular cluster of [Cd(C12H18Se2Br2)]. This lecture will deal with the chemical aspects of high quality nano-crystals.