Nanofluidic memristors,which use ions in electrolyte solutions as carriers,have been developed rapidly and brought new opportunities for the development of neuromorphic devices.Utilizing the transport and accumulation...Nanofluidic memristors,which use ions in electrolyte solutions as carriers,have been developed rapidly and brought new opportunities for the development of neuromorphic devices.Utilizing the transport and accumulation of ions in nanochannels to process information is an endeavor to realize the nanofluidic memristor.In this study,we report a new nanofluidic memristor,which is a polydimethylsiloxane(PDMS)-glass chip with two platinum(Pt)electrodes and well-aligned multi-nanochannels within PDMS for ion enrichment and depletion.The device not only exhibits typical bipolar memristive behavior and ion current rectification(ICR)but also demonstrates excellent endurance,maintaining stable performance after 100 sweep cycles.We systematically investigate the key factors affecting ion transport behavior in this memristor.The results show that the ICR ratio of the current-voltage(I-V)hysteresis curves decreases with increasing scan rate and solution concentration.Zeta potential measurements are introduced to reveal that the PDMS surface carries more negative charges in higher pH solutions,resulting in more pronounced memristive and ICR effects.Furthermore,our memristor can simulate short-term synaptic plasticity,such as paired-pulse facilitation(PPF)and paired-pulse depression(PPD),with a relatively low energy consumption of 12 pJ per spike per channel.Potentially,the inherent accessibility and robustness of our nanofluidic memristors facilitate the optimization of device structure and performance.These important observations and investigations lay a foundation for advancing energy-saving and efficient neuromorphic computing.展开更多
The conventional fabrication process for single-crystal nickel-based superalloy materials is directional solidifica-tion,which is classified as casting.With the rapid development of additive manufacturing(AM)technolog...The conventional fabrication process for single-crystal nickel-based superalloy materials is directional solidifica-tion,which is classified as casting.With the rapid development of additive manufacturing(AM)technologies,a novel process for fabricating single-crystal superalloys has become possible.This article reviews recent research on the AM of single-crystal nickel-based superalloys.Laser AM technologies,particularly directed energy deposition,are mainly used to repair single-crystal materials.Electron beam powder bed fusion is an innovative method for the direct fabrication of single-crystal materials.Accordingly,the mechanisms of single-crystal formation during AM are analyzed to elucidate the potential of this process route.Furthermore,this article discusses the challenges faced by AM for single-crystal fabrication,and provides perspectives on the trends of future developments.展开更多
基金This work is supported by the Fundamental Research Funds for the Central Universities(No.30923010603)the National Natural Science Foundation of China(No.62074079).
文摘Nanofluidic memristors,which use ions in electrolyte solutions as carriers,have been developed rapidly and brought new opportunities for the development of neuromorphic devices.Utilizing the transport and accumulation of ions in nanochannels to process information is an endeavor to realize the nanofluidic memristor.In this study,we report a new nanofluidic memristor,which is a polydimethylsiloxane(PDMS)-glass chip with two platinum(Pt)electrodes and well-aligned multi-nanochannels within PDMS for ion enrichment and depletion.The device not only exhibits typical bipolar memristive behavior and ion current rectification(ICR)but also demonstrates excellent endurance,maintaining stable performance after 100 sweep cycles.We systematically investigate the key factors affecting ion transport behavior in this memristor.The results show that the ICR ratio of the current-voltage(I-V)hysteresis curves decreases with increasing scan rate and solution concentration.Zeta potential measurements are introduced to reveal that the PDMS surface carries more negative charges in higher pH solutions,resulting in more pronounced memristive and ICR effects.Furthermore,our memristor can simulate short-term synaptic plasticity,such as paired-pulse facilitation(PPF)and paired-pulse depression(PPD),with a relatively low energy consumption of 12 pJ per spike per channel.Potentially,the inherent accessibility and robustness of our nanofluidic memristors facilitate the optimization of device structure and performance.These important observations and investigations lay a foundation for advancing energy-saving and efficient neuromorphic computing.
基金supported by National Key R&D Program of China(Grant No.2017YFB1103300).
文摘The conventional fabrication process for single-crystal nickel-based superalloy materials is directional solidifica-tion,which is classified as casting.With the rapid development of additive manufacturing(AM)technologies,a novel process for fabricating single-crystal superalloys has become possible.This article reviews recent research on the AM of single-crystal nickel-based superalloys.Laser AM technologies,particularly directed energy deposition,are mainly used to repair single-crystal materials.Electron beam powder bed fusion is an innovative method for the direct fabrication of single-crystal materials.Accordingly,the mechanisms of single-crystal formation during AM are analyzed to elucidate the potential of this process route.Furthermore,this article discusses the challenges faced by AM for single-crystal fabrication,and provides perspectives on the trends of future developments.
