In Situ High Temperature Synthesis
of Single-Component Metallic Nanoparticles
Version 3 2017-04-26, 05:21
Version 2 2017-04-13, 18:56
Version 1 2017-04-13, 18:52
Posted on 2017-04-26 - 05:21
Nanoparticles (NPs)
dispersed within a conductive host are essential
for a range of applications including electrochemical energy storage,
catalysis, and energetic devices. However, manufacturing high quality
NPs in an efficient manner remains a challenge, especially due to
agglomeration during assembly processes. Here we report a rapid thermal
shock method to in situ synthesize well-dispersed
NPs on a conductive fiber matrix using metal precursor salts. The
temperature of the carbon nanofibers (CNFs) coated with metal salts
was ramped from room temperature to ∼2000 K in 5 ms, which
corresponds to a rate of 400,000 K/s. Metal salts decompose rapidly
at such high temperatures and nucleate into metallic nanoparticles
during the rapid cooling step (cooling rate of ∼100,000 K/s).
The high temperature duration plays a critical role in the size and
distribution of the nanoparticles: the faster the process is, the
smaller the nanoparticles are, and the narrower the size distribution
is. We also demonstrated that the peak temperature of thermal shock
can reach ∼3000 K, much higher than the decomposition temperature
of many salts, which ensures the possibility of synthesizing various
types of nanoparticles. This universal, in situ,
high temperature thermal shock method offers considerable potential
for the bulk synthesis of unagglomerated nanoparticles stabilized
within a matrix.
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Yao, Yonggang; Chen, Fengjuan; Nie, Anmin; Lacey, Steven D.; Jacob, Rohit Jiji; Xu, Shaomao; et al. (2017). In Situ High Temperature Synthesis
of Single-Component Metallic Nanoparticles. ACS Publications. Collection. https://doi.org/10.1021/acscentsci.6b00374
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AUTHORS (13)
YY
Yonggang Yao
FC
Fengjuan Chen
AN
Anmin Nie
SL
Steven D. Lacey
RJ
Rohit Jiji Jacob
SX
Shaomao Xu
ZH
Zhennan Huang
KF
Kun Fu
JD
Jiaqi Dai
LS
Lourdes Salamanca-Riba
MZ
Michael R. Zachariah
RS
Reza Shahbazian-Yassar
LH
Liangbing Hu