2 research outputs found
Enhanced Electrogenerated Chemiluminescence in Thermoresponsive Microgels
The electrochemistry, photoluminescence
and electrogenerated chemiluminescence
of thermoresponsive redox microgels were investigated. For the first
time, reversible ECL enhancement is demonstrated in stimuli-responsive
100-nm microgel particles. Such an unexpected amplification reached
2 orders of magnitude, and it is intrinsically correlated with the
collapse of the microgel particles. The swell–collapse transition
decreases the average distance between adjacent redox sites and favors
the electron-transfer processes in the microgels resulting in the
enhanced ECL emission
Time- and Size-Resolved Plasmonic Evolution with nm Resolution of Galvanic Replacement Reaction in AuAg Nanoshells Synthesis
The
rational design of advanced nanomaterials with enhanced optical
properties can be reached only with the profound thermodynamic and
kinetic understanding of their synthetic processes. In this work,
the synthesis of monodisperse AuAg nanoshells with thin shells and
large voids is achieved through the development of a highly reproducible
and robust methodology based on the galvanic replacement reaction.
This is obtained thanks to the systematic identification of the role
played by the different synthetic parameters involved in the process
(such as surfactants, co-oxidizers, complexing agents, time, and temperature),
providing an unprecedented
control over the material’s morphological and optical properties.
Thus, the time- and size-resolved evolution of AuAg nanoshells surface
plasmon resonance band is described for 15, 30, 60, 80, 100, and 150
nm-sized particles spanning almost through the entire visible spectrum.
Its analysis reveals a four-phase mechanism coherent with the material’s
morphological transformation. Simulations based on Mie’s theory
confirm the observed optical behavior in AuAg nanoshells formation
and provide insights into the influence of the Au/Ag ratio on their
plasmonic properties. The high degree of morphological control provided
by this methodology represents a transferable and scalable strategy
for the development of advanced-generation plasmonic nanomaterials