【摘要】 近年来,在神经形态电子中,能够模拟突触功能的人工突触器件的研发引起了广泛关注.本文利用水热法制备出高比表面积的基于MoO₃纳米片的薄膜,并将其用于人工突触器件的制备,成功模拟了如:突触后兴奋电流（EPSC）、双脉冲易化（PPF）、脉冲持续时间依赖可塑性（SDDP）、脉冲电压依赖可塑性（SVDP）及脉冲速率依赖可塑性（SRDP）等神经突触的重要功能.更多还原

【Abstract】 Recently, neuromorphic systems capable of parallel information processing have attracted increasing attention. A neuromorphic system is desired to emulate a human brain, which consists of hundreds of billions of neurons connected with even more synapses. Synapses are important connection parts between neurons to transmit information through release and reception of neurotransmitters. A neuromorphic system could replicate brain learning, cognition and computation of a human brain to process huge data with 1016 floating point numbers per second. The high computing efficiency has attracted many researchers to study artificial synapses for application in future artificial intelligence. The synaptic weight could be adjusted by the received information. This provides a basis for the learning and computing capability of artificial synapses.So far, a number of semiconductor materials have been used in artificial synaptic devices, like some organic materials, e.g. Poly（3-hexylthiophene-2,5-diyl）（P3HT）, [1]Benzothieno[3,2-b][1]benzothiophene, 2,7-dioctyl-（C8-BTBT） etc, some inorganic oxides such as zinc oxide, indium zinc oxide（IZO）, indium gallium zinc oxide（IGZO）, transition metal oxides, etc, and two-dimensional materials, e.g. graphene, black phosphorus, and organic-inorganic hybrid perovskite materials. Among them, transition metal oxides are attractive due to their unique layered structure and inherent properties, which are important in photohydrolysis, lithium ion batteries,and field-effect transistors. MoO₃, as a typical transition-metal oxide, has been used in artificial synaptic devices, with different preparation methods, such as mechanical exfoliation, chemical vapor deposition（CVD）and chemical vapor transportation（CVT）, pulse-laser deposition（PLD）. Here, we report the preparation of a semiconductor layer of MoO₃ nanosheets by hydrothermal method, and the use of a TiO₂ nanoparticle seed layer to improve the adhesion of MoO3 nanosheets. This is a cost-effective and controllable process. The high surface-to-volume ratio of the material provides large contact area at the interface to allow easy ion diffusion.The device emulates important synaptic functions, such as excitatory post-synaptic current（EPSC）, pairedpulse facilitation（PPF）, spike-duration dependent plasticity（SDDP）, spike-voltage dependent plasticity（SVDP） and spike-rate dependent plasticity（SRDP）. This work could be an important addition to the neuromorphic research field.更多还原