Morphological Control of InxGa1–xP Nanocrystals Synthesized in a Nonthermal Plasma,Chemistry of Materials

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Morphological Control of InxGa1–xP Nanocrystals Synthesized in a Nonthermal Plasma
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-09 00:00:00 , DOI: 10.1021/acs.chemmater.8b01358
Noah D. Bronstein ₁ , Lance M. Wheeler ₁ , Nicholas C. Anderson ₁ , Nathan R. Neale ₁

Affiliation

We explore the growth of In_xGa_1–xP nanocrystals (x = 1, InP; x = 0, GaP; and 1 > x > 0, alloys) in a nonthermal plasma. By tuning the reactor conditions, we gain control over the morphology of the final product, producing either 10 nm diameter hollow nanocrystals or smaller 3 nm solid nanocrystals. We observe the gas-phase chemistry in the plasma reactor using plasma emission spectroscopy to understand the growth mechanism of the hollow versus solid morphology. We also connect this plasma chemistry to the subsequent native surface chemistry of the nanocrystals, which is dominated by the presence of both dative- and lattice-bound phosphine species. The dative phosphines react readily with oleylamine in an L-type ligand exchange reaction, evolving phosphines and allowing the particles to be dispersed in nonpolar solvents. Subsequent treatment by HF causes the solid InP_1.5 and In_0.5Ga_0.5P_1.3 to become photoluminescent, whereas the hollow particles remain nonemissive.

中文翻译：

非等离子体中In _x Ga _{1– x} P纳米晶体的形貌控制

我们探索了In _x Ga _{1– x} P纳米晶体的生长（x = 1，InP；x = 0，GaP；以及1> x> 0，合金）在非热等离子体中。通过调整反应器条件，我们可以控制最终产品的形貌，从而生产直径10 nm的空心纳米晶体或较小的3 nm固体纳米晶体。我们使用等离子体发射光谱学观察等离子体反应器中的气相化学，以了解中空与固体形态的生长机理。我们还将这种等离子体化学反应与随后的纳米晶体自然表面化学反应联系起来，该化学反应主要由键合于键合和晶格结合的膦物种的存在所决定。在L型配体交换反应中，定型膦容易与油胺反应，生成膦，并使颗粒分散在非极性溶剂中。后续的HF处理会导致固体InP _1.5和In_0.5 Ga _0.5 P _1.3变为光致发光，而中空粒子则保持不发光。

更新日期：2018-04-09

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