title: Growth of dandelion-shaped CuInSe2 nanostructures by a two-step solvothermal process.
abstract: CuInSe(2) (CIS) nanodandelion structures were synthesized by a two-step solvothermal approach. First, InSe nanodandelions were prepared by reacting In(acac)(3) with trioctylphosphine-selenide (TOP-Se) in 1-octadecene (ODE) at 170 °C in the presence of oleic acid. These InSe dandelions were composed of polycrystalline nanosheets with thickness < 10 nm. The size of the InSe dandelions could be tuned within the range of 300 nm-2 µm by adjusting the amount of oleic acid added during the synthesis. The InSe dandelion structures were then reacted with Cu(acac)(2) in the second-step solvothermal process in ODE to form CIS nanodandelions. The band gap of the CIS dandelions was determined from ultraviolet (UV) absorption measurements to be ∼ 1.36 eV, and this value did not show any obvious change upon varying the size of the CIS dandelions. Brunauer-Emmett-Teller (BET) measurements showed that the specific surface area of these CIS dandelion structures was 44.80 m(2) g(-1), which was more than five times higher than that of the CIS quantum dots (e.g. 8.22 m(2) g(-1)) prepared by using reported protocols. A fast photoresponsive behavior was demonstrated in a photoswitching device using the 200 nm CIS dandelions as the active materials, which suggested their possible application in optoelectronic devices.
authors: School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
authors: Wenwen
authors: W
authors: Zhou
authors: Zongyou
authors: Z
authors: Yin
authors: Dao Hao
authors: DH
authors: Sim
authors: Hua
authors: H
authors: Zhang
authors: Jan
authors: J
authors: Ma
authors: Huey Hoon
authors: HH
authors: Hng
authors: Qingyu
authors: Q
authors: Yan
mesh_terms: D000475:Alkenes / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D004581:Electronics; D006358:Hot Temperature; D007204:Indium / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods*; D009584:Nitrogen / Q000737:chemistry; D019301:Oleic Acid / Q000737:chemistry; D055095:Optics and Photonics; D045663:Quantum Dots; D012643:Selenium / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000475:Alkenes; D012997:Solvents; D007204:Indium; D019301:Oleic Acid; D003300:Copper; C109760:1-octadecene; D012643:Selenium; D009584:Nitrogen