Simple, Low-Temperature Route To Synthesize ZnO Nanoparticles and Their Optical Neuromorphic Characteristics,ACS Applied Electronic Materials

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Simple, Low-Temperature Route To Synthesize ZnO Nanoparticles and Their Optical Neuromorphic Characteristics
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2021-08-27 , DOI: 10.1021/acsaelm.1c00471
Ramachandrapanicker Devi Chandra ₁ , Kunnel Gopalan Gopchandran ₁

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Wurtzite ZnO nanoparticles were synthesized using a simple one-step process at temperatures of 30–100 °C. X-ray diffraction (XRD) analyses show a conversion of crystalline phase of Zn(OH)₂ to wurtzite ZnO at a synthesis temperature of 60 °C. High-resolution transmission electron microscope (HRTEM) images show that the resulting ZnO nanoparticles are highly crystalline. Photoluminescence spectra of the samples show that the oxygen vacancies that generally cause the green emission in ZnO is spectacularly low in these samples, which were further illustrated using X-ray photoelectron spectroscopy (XPS) analyses. The band gap was estimated using optical absorption spectroscopy. Further, the samples were analyzed using micro-Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy. Photodetectors constructed using ZnO nanoparticles show a clear photoresponse to ultraviolet (UV) light. Further, we measured the photosynaptic response of the devices to ultraviolet light pulses. The excitatory postsynaptic current (EPSC) with a constant paired pulse facilitation (PPF) shows that these nanoparticle devices are promising candidates for linear optical synaptic devices.

中文翻译：

合成氧化锌纳米粒子的简单低温途径及其光学神经形态特征

在 30-100 °C 的温度下，使用简单的一步法合成纤锌矿 ZnO 纳米颗粒。X 射线衍射 (XRD) 分析表明 Zn(OH) ₂的结晶相发生了转化在 60 °C 的合成温度下合成纤锌矿 ZnO。高分辨率透射电子显微镜 (HRTEM) 图像显示所得 ZnO 纳米颗粒是高度结晶的。样品的光致发光光谱表明，通常导致 ZnO 中绿色发射的氧空位在这些样品中非常低，使用 X 射线光电子能谱 (XPS) 分析进一步说明了这一点。使用光吸收光谱估计带隙。此外，使用微拉曼光谱和傅里叶变换红外 (FTIR) 光谱分析样品。使用 ZnO 纳米粒子构建的光电探测器对紫外 (UV) 光显示出清晰的光响应。此外，我们测量了设备对紫外光脉冲的光突触响应。

更新日期：2021-09-28

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