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IBM Scientists First to Distinguish Individual Molecular Bonds

By Guest PostSeptember 14, 2012Scienceafm, alejandro criado, atom diameter, atomic force, bandwidth wireless, bond, buckyball, c60, carbon carbon, carbon monoxide, chemical bond, chemical structure, ciqus, co, diego pena, diodes, enrique guitian, graphene, hexagon, ibm, individual molecule, leo gross, light emitting, microscopy, noncontact, oleds, organic, pahs, pentagon, polyaromatic systems, polycyclic aromatic hydrocarbons, scientist, technique

Atomic force microscopy helps scientists to reveal the bond order and length of bonds within molecules

Technique can be used to study future devices made from graphene

Zurich, Switzerland – 14 Sep 2012: IBM scientists have been able to differentiate the chemical bonds in individual molecules for the first time using a technique known as noncontact atomic force microscopy (AFM).

The results push the exploration of using molecules and atoms at the smallest scale and could be important for studying graphene devices, which are currently being explored by both industry and academia for applications including high-bandwidth wireless communication and electronic displays. (more…)

Nanocrystals Go Bare: Berkeley Lab Researchers Strip Material’s Tiny Tethers

By Guest PostDecember 12, 2011Scienceanna llordes, april sawvel, berkeley lab, brett helms, carbon hydrogen bonds, chemical solution, delia milliron, devices, diodes, electronic conductivity, energy storage, environments, evelyn rosen, hydrocarbon, ink jet printer, lawrence berkeley national laboratory, ligand free nanocrystal, ligands, meerwein salt, metal oxides, metallic, molecular foundry, molecular vibrations, naked nanocrystals, nano ir, nanocrystal, nanoscale infrared spectroscopy, orders of magnitude, organic compound, organic ligands, organometallic molecules, oxidizing agents, photovoltaics, raffaella buonsanti, selenide nanocrystal, semiconductors, smart windows, solar fuels, spin, spray coating, stripping nanocrystals, strong acids, supercapacitor materials, surface ligands, tether like molecules, triethyloxonium tetrafluoroborate, universal technique, unstripped nanocrystal films, variety of applications

Researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have discovered a universal technique for stripping nanocrystals of tether-like molecules that until now have posed as obstacles for their integration into devices. These findings could provide scientists with a clean slate for developing new nanocrystal-based technologies for energy storage, photovoltaics, smart windows, solar fuels and light-emitting diodes.

Nanocrystals are typically prepared in a chemical solution using stringy molecules called ligands chemically tethered to their surface. These hydrocarbon-based or organometallic molecules help stabilize the nanocrystal, but also form an undesirable insulating shell around the structure. Efficient and clean removal of these surface ligands is challenging and has eluded researchers for decades. (more…)

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IBM Scientists First to Distinguish Individual Molecular Bonds

Nanocrystals Go Bare: Berkeley Lab Researchers Strip Material’s Tiny Tethers