1 research outputs found
Systematic Study on the Precursor Reduction Kinetics and Growth Pattern for Size-Tunable Palladium Nanocubes
Unveiling
the underlying chemistry during the growth of well-defined
nanocrystals is a fundamental but challenging task in materials chemistry.
Herein, Pd NCs with tunable sizes ranging from 4.5 to 23.5 nm have
been synthesized in the presence of potassium acetate (KOAc). The
Pd precursor variation trends of these preparation systems along with
reaction time have been determined using a UV–vis spectrometer,
and corresponding reduction kinetic parameters, including the apparent
reduction rate constant (k) and activation energy
(Ea), are calculated by regarding the
reduction processes as quasi-first-order reactions. It is confirmed
that the introduction of KOAc does not affect the value of the Ea of different reaction systems. The interrelationship
of k, product size (d), and reaction
temperature (T) is discussed in depth. Results indicate
that the three parameters are closely related, and for given reaction
systems, they are specified. With the careful investigation of six
specific systems (reaction systems with 10 mM, 20 mM KOAc at 55 °C,
with 5 mM, 10 mM KOAc at 65 °C, without KOAc at 75 °C, and
with 5 mM KOAc at 85 °C), the growth pattern of Pd NCs is described
with an empirical expression and is further confirmed as a synergistic
result of k and T