SCIENCE & TECHNOLOGY
standard conditions. Using the same materials, they also measured the rate of photocatalytic decomposition of phenol. The key result reported by the group is ACS MEETING NEWS: Surprising results question key assumptions that nanotubes containing hematite—esabout effectiveness of nanotubes in solar cells pecially rim-coated nanotubes, in which the interior tube surface remains exposed and available to mediate reactions—are far RESEARCHERS IN South Korea have oblight-harvesting capabilities of the hybrid. less active photochemically than uncoated tained data that questions key assumptions Tae Hwa Jeon and Hyunwoong Park of samples. about the photochemical properties of Kyungpook National University, in Daegu, “It’s a surprising result that suggests semiconductor nanotubes. and coworkers examined that prediction that the interior surface of these nanotubes The work suggests that is not as photoactive as peoseemingly promising strateple would think,” says Chad gies for using nanotubes to D. Vecitis, a Harvard Universiboost the performance of ty professor of environmental solar cells and photocatalysts engineering. He adds that the based on titanium dioxide, work is likely “to bring up a a well-studied candidate for new discussion and help push those applications, may be investigations in a direction less effective than expected. that will provide answers.” The study was presented Park proposed that the last week at the American unexpectedly low activity Chemical Society national could result from hematiteCALL FOR ACTION Comparison of the catalytic properties meeting in Anaheim, Calif., at induced charge recombinaof untreated TiO2 nanotubes (left) and ones in which just the a Division of Fuel Chemistry tion, a process in which excirims are coated with iron oxide (right) raises questions about key symposium on solar energy tations induced by photons assumptions about these materials’ photochemical properties. conversion and has just been are quickly quenched by published in the Journal charge transfer at the hemaof Physical Chemistry C (DOI: 10.1021/ by preparing unhybridized TiO2 nanotubes tite-nanotube interface. He added that jp201215t). and hybridized nanotubes with nanocrysa telling follow-up experiment, one that Compared with pure TiO2 nanoparticles, talline hematite (α-Fe2O3) particles deposwould home in on the photoactivity of the TiO2 nanotubes and nanotubes made from ited on their rims or filling the nanotubes nanotubes’ internal surfaces, would be to TiO2 hybridized with iron oxide are precompletely. The team used those materials, repeat the measurements—this time usdicted to exhibit enhanced photoproperties as well as TiO2 nanoparticle films and other ing nanotubes that have been selectively as a result of increased light scattering from control samples, to measure photocurrents hybridized with photoinactive materithe tubes’ internal surfaces and the broader generated in electrolyte solution under als.—MITCH JACOBY J. PHYS. CHEM. C
NANOTUBE INACTIVITY
Bioconjugation Chemistry Heterobifunctional Linkers / Functionalization Reagents
BMPS n = 2 [S0427] GMBS n = 3 [S0399] EMCS n = 5 [S0428]
SPDP [S0819]
Fluorescent Probe Biotins
_-Lipoic Acid DL - [L0058] (R)- [L0207] (S )- [L0208]
5-FITC [F0026]
R = H [B0463] R = Succinimidyl [S0491]
Condensation Reagents EDC
[D1601]
DIC [D0254]
CDI [C0119]
CMC [C0793]
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