期刊
RSC ADVANCES
卷 5, 期 119, 页码 98110-98117出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra19938g
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资金
- National Natural Science foundation of China [51231004, 51371103]
- National Hi-tech (R&D) project of China [2014AA032901, 2012AA03A706]
- Brain Inspired Computing Research, Tsinghua University [20141080934]
Heavy ion Nd3+ is introduced into the electrolyte layer to study frequency selectivity of a semiconducting polymer/electrolyte double-layer cell. This cell exhibits long-term depression under low-frequency stimulations and potentiation under high-frequency stimulations by positive triangular pulses, suggesting a conventional learning protocol, i.e., spike-rate-dependent plasticity. The frequency selectivity depends significantly on the input shape due to large ionic size and mass. The input threshold of the frequency selectivity is around the voltage inducing a negative differential resistance (V-NDR) influenced by the loading rate. The typical value of V-NDR is 0.3 V for a loading rate of 100 V s(-1), but V-NDR disappears when the loading rate exceeds 1000 V s(-1). Besides, the frequency selectivity has not been observed under rectangular pulse input. Moreover, the possibility of bidirectional signal transfer has been tested simply by anti-connecting two individual cells. Our study suggests the possibility to realize signal pruning and synthetizing by changing ionic types.
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