Details

Autor(en) / Beteiligte

• Oh, Seung Hwan
• Kim, Yong

Titel

Cubic ZnP nanowire growth catalysed by bismuth

Ist Teil von

• CrystEngComm, 2021-03, Vol.23 (11), p.2297-233

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Zn 3 P 2 and ZnP 2 nanowires were grown by physical vapour transport using a bismuth catalyst. Bismuth with a low surface energy and melting temperature is an ideal catalyst for the growth of Zn-P binary nanowires. The ZnP 2 nanowires were synthesized using a Zn 3 P 2 source with extra phosphorus vapour supplied from a separate phosphorus source. The Zn 3 P 2 nanowires had a conventional α-Zn 3 P 2 tetragonal crystal structure. Surprisingly, the ZnP 2 nanowires had a cubic γ-ZnP 2 structure, which is known to be stable only at pressures higher than 1.5 GPa, and its existence is a matter of debate. We observed that Bi catalyst was the deterministic parameter for the formation of γ-ZnP 2 . The lattice constants ( a = 0.53578 nm) of the nanowires were determined from their d -spacing. Unlike the α-Zn 3 P 2 nanowires, the γ-ZnP 2 nanowires showed a Raman band (430-470 cm −1 ) because of the internal vibrations of infinite phosphorus chains. From the contact angle analysis, the growth of the γ-ZnP 2 nanowires when catalysed by bismuth, was dominated by centre nucleation rather than triple phase boundary nucleation. A nucleus with smaller dimensions is energetically favorable for centre nucleation, and the γ-ZnP 2 nucleus formed during the initial stage of nucleation resulted in the formation of the cubic γ-ZnP 2 nanowires. The centre nucleation model may explain the stability of γ-ZnP 2 phase even at the synthesis pressure (100-600 Torr). The ZnP 2 nanowires catalysed by bismuth had a cubic γ-ZnP 2 structure, which is known to be stable only at pressures higher than 1.5 GPa, and its existence is a matter of debate.