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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).
Sprache
Englisch
Identifikatoren
ISSN: 1466-8033
eISSN: 1466-8033
DOI: 10.1039/D1CE00029B
Titel-ID: cdi_crossref_primary_10_1039_D1CE00029B
Format
–
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