Plasma-Like Negative Capacitance in Nano-Colloids
J. Shulman (1), S. Tsui (1), F. Chen (1), Y. Y. Xue (1), C. W. Chu (1, and 2, 3) ((1) Department of Physics, TCSUH, University of Houston,, Houston, Texas, (2) Lawrence Berkeley National Laboratory, Berkeley,, California, (3) Hong Kong University of Science, Technology
TL;DR
This paper reports the observation of plasma-like negative capacitance in a nano-colloid at low frequencies, revealing a collective excitation and an unusual energy storage mechanism supported by experimental and modeling evidence.
Contribution
It introduces the discovery of plasma-like negative capacitance in nano-colloids and links it to a collective excitation, expanding understanding of nano-scale electrochemical phenomena.
Findings
Negative capacitance observed between 0.1 and 10^-5 Hz
Response is linear over broad conditions
Consistent with free-carrier plasma model
Abstract
A negative capacitance has been observed in a nano-colloid between 0.1 and 10^-5 Hz. The response is linear over a broad range of conditions. The low-omega dispersions of both the resistance and capacitance are consistent with the free-carrier plasma model, while the transient behavior demonstrates an unusual energy storage mechanism. A collective excitation, therefore, is suggested.
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