Assembly of Phosphide Nanocrystals into Porous Networks: Formation of InP Gels and Aerogels
Hitihami-Mudiyanselage, A; Senevirathne, K; Brock, SL
| HERO ID | 1960969 |
|---|---|
| In Press | No |
| Year | 2013 |
| Title | Assembly of Phosphide Nanocrystals into Porous Networks: Formation of InP Gels and Aerogels |
| Authors | Hitihami-Mudiyanselage, A; Senevirathne, K; Brock, SL |
| Journal | ACS Nano |
| Volume | 7 |
| Issue | 2 |
| Page Numbers | 1163-1170 |
| Abstract | The applicability of sot-gel nanoparticle assembly routes, previously employed for metal chalcogenides, to phosphides is reported for the case of InP. Two different sizes (3.5 and 6.0 nm) of InP nanoparticles were synthesized by solution-phase arrested precipitation, capped with thiolate ligands, and oxidized with H2O2 or O-2/light to induce gel formation. The gels were aged, solvent-exchanged, and then supercritically dried to obtain aerogels with both meso- (2-50 nm) and macropores (>50 nm) and accessible surface areas of similar to 200 m(2)/g. Aerogels showed higher band gap values relative to precursor nanoparticles, suggesting that during the process of assembling nanoparticles into 3D architectures, particle size reduction may have taken place. In contrast to metal chalcogenide gelation, InP gels did not form using tetranitromethane, a non-oxygen-transferring oxidant. The requirement of an oxygen-transferring oxidant, combined with X-ray photoelectron spectroscopy data showing oxidized phosphorus, suggests gelation is occurring due to condensation of phosphorus oxoanionic moieties generated at the interfaces. The ability to link discrete InP nanoparticles Into a 3D porous network while maintaining quantum confinement is expected to facilitate exploitation of nanostructured InP in solid-state devices. |
| Doi | 10.1021/nn305959q |
| Pmid | 23346878 |
| Wosid | WOS:000315618700033 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | InP; gels; aerogels; III-V semiconductors; quantum confinement |