Synthesis of indium phosphide particles by hot injection method
| dc.contributor.author | Lim Wan Xuan | |
| dc.date.accessioned | 2021-02-17T02:59:38Z | |
| dc.date.available | 2021-02-17T02:59:38Z | |
| dc.date.issued | 2019-07 | |
| dc.description.abstract | Indium phosphide quantum dots (InP QDs) are rising up to substitute cadmiumbased QDs which consist of toxic element. Hot injection method was performed to synthesize InP QDs. Previous study found that the common used phosphorus precursor, tris(trimethylsilyl)phosphine (P(Si(CH3)3)3) is highly toxic and expensive. Therefore, tris(dimethylamino)phosphine (P(N(CH3)2)3) and trioctylphosphine (TOP) which are environment friendly were employed as the phosphorus reagents in this study. The InP QDs were synthesised by mixing indium (III) acetate and myristic acid in two different types of ligands including 1-octadecene (ODE) and oleylamine (OLA), followed by rapid injection of two different types of phosphorus sources. Growth time and molar ratio (In:P) were studied to determine the optimum conditions in yielding monodispersed particle size of InP QDs. Based on UV-Vis absorption spectra, the optimum parameters for growth time and molar ratio (In:P) were 4 hours 30 minutes and 2:1 respectively. The first exciton peak at these parameters was located at 490 nm (3.3 eV). The synthesised InP was observed to be in a wide range of particle sizes with aggregation which was proven by FESEM and AFM. Purification study was investigated to obtain the most suitable ratio of solvent used in purifying the crude product of InP QDs. FTIR analysis showed that complete removal of by-product was done by the ratio of crude product to methanol and acetone at 1:1:10. Stability study of InP QDs was investigated and concluded that the InP particles were stable over a month. This was proven by the constant absorption spectra at 300 nm throughout the whole month. The effect of etching by hydrofluoric (HF) acid was studied. A significant blue-shift of absorption spectra was exhibited by small sized of nanocrystals. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/11323 | |
| dc.language.iso | en | en_US |
| dc.title | Synthesis of indium phosphide particles by hot injection method | en_US |
| dc.type | Other | en_US |
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