Phase-Selective
Cation-Exchange Chemistry in Sulfide
Nanowire Systems
Dandan Zhang
Andrew B. Wong
Yi Yu
Sarah Brittman
Jianwei Sun
Anthony Fu
Brandon Beberwyck
A. Paul Alivisatos
Peidong Yang
10.1021/ja511010q.s001
https://acs.figshare.com/articles/journal_contribution/Phase_Selective_Cation_Exchange_Chemistry_in_Sulfide_Nanowire_Systems/2224558
As a cation-deficient, <i>p</i>-type semiconductor, copper
sulfide (Cu<sub>2–<i>x</i></sub>S) shows promise
for applications such as photovoltaics, memristors, and plasmonics.
However, these applications demand precise tuning of the crystal phase
as well as the stoichiometry of Cu<sub>2–<i>x</i></sub>S, an ongoing challenge in the synthesis of Cu<sub>2–<i>x</i></sub>S materials for a specific application. Here, a detailed
transformation diagram of cation-exchange (CE) chemistry from cadmium
sulfide (CdS) into Cu<sub>2–<i>x</i></sub>S nanowires
(NWs) is reported. By varying the reaction time and the reactants’
concentration ratio, the progression of the CE process was captured,
and tunable crystal phases of the Cu<sub>2–<i>x</i></sub>S were achieved. It is proposed that the evolution of Cu<sub>2–<i>x</i></sub>S phases in a NW system is dependent
on both kinetic and thermodynamic factors. The reported data demonstrate
that CE can be used to precisely control the structure, composition,
and crystal phases of NWs, and such control may be generalized to
other material systems for a variety of practical applications.
2014-12-17 00:00:00
tunable crystal phases
material systems
cadmium sulfide
crystal phases
transformation diagram
crystal phase
copper sulfide
CE process
NW system
reaction time
applications demand
Cu
Sulfide Nanowire SystemsAs