The
chemical mechanism (CM) of surface-enhanced Raman
scattering
(SERS) has been recognized as a decent approach to mildly amplify
Raman scattering. However, the insufficient charge transfer (CT)
between the SERS substrate and molecules always results in unsatisfying
Raman enhancement, exerting a substantial restriction for CM-based
SERS. In principle, CT is dominated by the coupling between the energy
levels of a semiconductor-molecule system and the laser wavelength,
whereas precise tuning of the energy levels is intrinsically difficult.
Herein, two-dimensional transition-metal dichalcogenide alloys, whose
energy levels can be precisely and continuously tuned over a wide
range by simply adjusting their compositions, are investigated. The
alloys enable on-demand construction of the CT resonance channels
to cater to the requirements of a specific target molecule in SERS.
The SERS signals are highly reproducible, and a clear view of the
SERS dependences on the energy levels is revealed for different CT
resonance terms.
The purpose of this work is to study the electrochemical behavior of uranium and cerium in fused In/3LiCl-2KCl system in the temperature range of 723-823 K by open-circuit potentiometry. The apparent electrode potential of Ce 3+ /Ce (U 4+ /U) couples and apparent standard potential of Ce-In (U-In) alloys vs AgCl/Ag reference electrode were established. The principal thermodynamic properties, activity and solubility of cerium and uranium were determined. The separation factor of uranium/cerium couple on liquid indium electrode was calculated. The experimental results have been shown that a lower temperature should be more effective for the separation uranium from cerium.
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