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| 1 | Ultrathin-shell epitaxial Ag@Au core-shell nanowires for high-performance and chemically-stable electronic, optical, and mechanical devices显示文摘Silver nanowires (AgNWs) hold great promise for applications in wearable electronics, flexible solar cells, chemical and biological sensors, photonic/plasmonic circuits, and scanning probe microscopy (SPM) due to their unique plasmonic, mechanical, and electronic properties. However, the lifetime, reliability, and operating conditions of AgNW-based devices are significantly restricted by their poor chemical stability, limiting their commercial potentials. Therefore, it is crucial to create a reliable oxidation barrier on AgNWs that provides long-term chemical stability to various optical, electrical, and mechanical devices while maintaining their high performance. Here we report a room-temperature solution-phase approach to grow an ultra-thin, epitaxial gold coating on AgNWs to effectively shield the Ag surface from environmental oxidation. The Ag@Au core-shell nanowires (Ag@Au NWs) remain stable in air for over six months, under elevated temperature and humidity (80 °C and 100% humidity) for twelve weeks, in physiological buffer solutions for three weeks, and can survive overnight treatment of an oxidative solution (2% H2O2). The Ag@Au core-shell NWs demonstrated comparable performance as pristine AgNWs in various electronic, optical, and mechanical devices, such as transparent mesh electrodes, surface-enhanced Raman spectroscopy (SERS) substrates, plasmonic waveguides, plasmonic nanofocusing probes, and high-aspect-ratio, high-resolution atomic force microscopy (AFM) probes. These Au@Ag core-shell NWs offer a universal solution towards chemically-stable AgNW-based devices without compromising material property or device performance. | Yangzhi Zhu Sanggon Kim Xuezhi Ma Peter Byrley Ning Yu Qiushi Liu Xiaoming Sun Da Xu Sangshan Peng Martin C.Hartel Shiming Zhang Vadim Jucaud Mehmet R.Dokmeci Ali Khademhosseini Ruoxue Yan | 2021 | Nano Research2021，14，11： | 1 |
| 2 | Oriented electron tunneling transport in hierarchical Ag/SiO_(2)/TiO_(2) nanobowl arrays for plasmonic solar water splitting显示文摘Hierarchical Ag/SiO_(2)/TiO_(2) nanobowl(NB)arrays were fabricated for use as plasmonic photoanodes for solar-hydrogen conversion.The nanobowls had large pore size and were composed of an upper TiO_(2) nanoring and a lower TiO_(2) nanohole.A thin SiO_(2) inter-layer was introduced as an electron transmission channel to change the mechanism of hot electron transport.Simulations were performed to characterize the variation of electron concentration in Ag/SiO_(2)/TiO_(2) NB arrays,taking into account both the optical transition of photogenerated electrons,and electron tunneling.The multiphysics coupling function of COMSOL software provided the light source for optical transition of photogenerated electrons,and a Wentzel-Kramers-Brillouin model was employed to represent the tunneling.The results demonstrate that the TiO_(2) nanoring was a transporter,which transmitted electrons downward to the nanohole.The SiO_(2) layer replaces the Schottky barrier to become a bridge for tunneling of hot electrons in high-and low-energy states into TiO_(2).Moreover,the coverage of the SiO_(2) layer helped increase the light absorption of TiO_(2),it also reduced the near electric field coupling between Ag and TiO_(2).Accordingly,under AM 1.5 light irradiation,the photocurrent density and average hydrogen evolution rate of Ag/SiO_(2)/TiO_(2) were 1.8 and 2.2 times higher,respectively,than those of pure TiO_(2),implying far more efficient migration of carriers. | Zexin Yu Lixia Sang Angran Cao Yunlong Gao | 2022 | Nano Research2022，15，2： | 1 |
| 3 | 二维贵金属纳米颗粒有序阵列的制备及应用显示文摘二维贵金属纳米颗粒有序阵列,除了具有贵金属纳米颗粒自身的表面等离子体共振特性外,由于其有序规整的阵列结构,还可产生新颖或增强的光学性质等特性,并具有良好的性能稳定性与重现性,因而备受研究者关注。文章重点介绍了二维贵金属纳米颗粒有序阵列的主要制备方法,包括模板法和自组装法。相比于传统的光刻技术,模板法和自组装法不仅可以得到高质量的二维纳米颗粒阵列,而且经济成本较低。进一步,该文简要总结了二维贵金属纳米颗粒有序阵列在光学传感、催化等领域的应用,但二维贵金属纳米颗粒阵列的形貌比较单一,更多的性能有待于进一步的发掘。 | 门丹丹 邢昌昌 李文娟 张洪华 李越 | 2021 | 南通大学学报(自然科学版)2021，20，4： | 1 |
| 4 | Single-walled carbon nanotube based SERS substrate with single molecule sensitivity显示文摘In single molecule study,surface-enhanced Raman scattering(SERS)has the advantage of specifically providing structural information of the molecules targeted.The main challenge in single molecule SERS is developing reusable plasmonic substrates that ensures single molecule sensitivity and acquires intrinsic information of molecules.Here,we proposed a strategy to utilize single-walled carbon nanotubes(SWNTs)to construct SERS substrates.Employing ultrasonic spray pyrolysis,we prepared in situ polyhedral gold nanocrystals closely spaced and attached to nanotubes,ensuring valid hot spots formed along the tube-walls.With such SERS substrates,we proved the single molecule detection by the statistical analysis based on the natural abundance of isotopes.Since SWNTs provide non-chemical bonding adsorption sites,our SERS substrates are easily reusable and have a unique advantage of preserving the intrinsic property of the molecules detected.Using SWNTs to build SERS substrates may become a powerful general strategy in various static and dynamic studies of single molecules. | Chenmaya Xia Daqi Zhang Henan Li Sheng Li Haoming Liu Li Ding Xiyan Liu Min Lyu Ruoming Li Juan Yang Yan Li | 2022 | Nano Research2022，15，1： | 0 |
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