共查询到19条相似文献，搜索用时 62 毫秒
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首先采用水热法制备 TiO2纳米棒光阳极,并引入 Au@SiO2纳米颗粒对其性能进行改善。结果表明,Au@SiO2纳米颗粒的引入虽然增强了光吸收,但同时减少了染料在 TiO2纳米棒上的吸附量,反而导致了电池器件性能的下降。因此,在 TiO2纳米棒/Au@SiO2纳米颗粒结构上进一步生长一层 TiO2钝化层：一方面可增加染料吸附量;另一方面有利于减少电荷复合。基于这种光阳极组装的染料敏化太阳能电池获得了 2.34%的光电转换效率,较单一 TiO2纳米棒光阳极组装的电池效率提高了 60%。 相似文献
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采用真空蒸镀的方法在多孔氧化铝模板表面得到薄金膜,随后在真空管式炉中进行热处理,热处理中发生的热去湿过程使得金膜在多孔氧化铝表面形成有序的金纳米颗粒阵列。同时还研究了多孔氧化铝模板制备过程中二次氧化的作用,发现一次氧化对二次氧化进行具有一定指导作用;另外,研究了扩孔时间对模板孔径的影响,一定条件下,扩孔时间与孔径成正比例关系;最后研究了镀膜厚度对金纳米颗粒的影响,结果中可以看到,金膜的厚度直接影响金纳米颗粒阵列的形成。最后在分光光度计上的光学测量吸收光谱的结果中,出现了表面等离子体作用引起的很强的吸收峰。 相似文献
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超快脉冲激光激发的纳米真空器件能够同时实现高频率和低功耗,并且有望将电子器件响应时间推进至飞秒甚至阿秒量级,从而进一步提高器件的工作频率,是未来高频电子器件的重要技术路线。本文利用原子级平整的单晶金设计并制备了一种基于领结型(bowtie)纳米隧道结的新型电子隧穿器件。重点研究了器件静态和超快激光激发的电子发射性能,利用模拟计算研究了bowtie结构对电子发射性能的影响,深入分析了器件的光电子发射机制,实现了具有四次幂的高非线性多光子发射电流,有望实现新型超快纳米真空电子器件。 相似文献
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提出了一种新的表征方法--膜电位测量。膜电位恢复时间与膜穿孔尺寸相对应,因此建立起细胞膜穿孔尺寸的大小与激光能量阈值之间的关系,可为准确地向细胞内递送不同分子量的外源物质提供理论支持。将金纳米颗粒与胃癌细胞共同培养,在保证细胞不受金纳米颗粒毒性影响的前提下,选择不同能量纳秒脉冲激光照射共孵育后的胃癌细胞,并采用碘化丙啶(PI)和钙黄绿素乙酰甲酯(Calcein-AM)对穿孔后的细胞进行染色验证。结果发现:当加入直径为100 nm的金纳米颗粒,其数量与细胞数比为400\:1,激光能量密度在20 mJ/cm^2时,可以在保证细胞活性的前提下成功实现532 nm脉冲激光的细胞膜穿孔;在穿孔条件下,采用光标测技术测量细胞膜电位,发现细胞膜电位先增加后复原,最大增量为50 mV,恢复时间为250 s。膜电位结果再次验证,光穿孔造成的细胞膜损伤是可以恢复的,而且可以用膜电位变化来表征。 相似文献
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硝酸根过量是导致水污染的主要原因之一。针对表面增强拉曼光谱技术直接检测水中硝酸根检出限低,无法达到国家地下水环境质量标准的问题,本课题组制备了一种半胱胺修饰金纳米粒子（AuNPs）的复合SERS基底,利用带正电荷的半胱胺对周围带负电荷的金纳米颗粒进行功能化修饰,增加SERS基底对硝酸根的亲和性,提高其对硝酸根的检测灵敏度。实验结果表明：使用去离子水浸泡自组装10-3 mol/L半胱胺的盖玻片3h,再修饰20mL金溶胶,这样制成的金纳米颗粒-半胱胺复合SERS基底的增强性能最佳,对硝酸钾的增强因子为2.14×105;8片不同基底上硝酸钾SERS信号的相对标准偏差为10.36%,检出限为0.01mg/L,达到国家地下水环境质量标准规定的Ⅰ类水的检测标准,对光谱法测量水中总氮含量具有重要意义。 相似文献
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《Advanced Electronic Materials》2018,4(9)
Black phosphorus (BP) has attracted enormous interest for logic applications due to its unique electronic properties. However, pristine BP exhibits predominant p‐type channel conductance, which limits the realization of complementary circuits unless an effective n‐type doping is found. Here, a practical approach to transform the conductivity of BP from p‐type to n‐type via a spatially controlled aluminum (Al) doping is proposed. Symmetrical threshold voltage for the pair of p‐type and n‐type BP field‐effect transistors can be achieved by tuning the Al doping concentration. The complementary inverter circuit shows a clear logic inversion with a high voltage gain of up to ≈11 at a supply voltage (VDD) of 1.5 V. Simultaneously, a high noise margin of 0.27 × VDD is achieved for both low (NML) and high (NMH) input voltages, indicating excellent noise immunity. Moreover, a three‐stage ring oscillator with a theoretical frequency above 1.8 GHz and microwatt level power dissipation is modeled, which shows a low propagation delay per stage. This study demonstrates a practical approach to fabricate high performance complementary integrated circuits on a homogenous BP channel material, paving the way toward complex cascaded circuits and sensor interface applications. 相似文献
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研究不同浓度下金颗粒粒径的测量时间。介绍了PCCS法（光子交叉相关光谱法）测量纳米颗粒粒径的基本原理。运用PCCS法测量了不同时间不同浓度下平均粒径为24.5 nm的金颗粒粒径。测量结果表明,相同的测量时间,悬浮液浓度越高,多次测量标准差越小;相同的悬浮液浓度下,测量时间越长,多次测量结果标准差越小。拟合了各个浓度下测量结果标准差与测量时间之间的曲线,利用拟合曲线,可根据需要的测量精度,选择在该浓度下的测量时间。 相似文献
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Ningqin Deng He Tian Jian Zhang Jinming Jian Fan Wu Yang Shen Yi Yang Tian-Ling Ren 《半导体学报》2021,42(8):21-33
Black phosphorus(BP),an emerging two-dimensional material,is considered a promising candidate for next-genera-tion electronic and optoelectronic devices due to in-plane anisotropy,high mobility,and direct bandgap.However,BP devices face challenges due to their limited stability,photo-response speed,and detection range.To enhance BP with powerful electric-al and optical performance,the BP heterostructures can be created.In this review,the state-of-the-art heterostructures and their electrical and optoelectronic applications based on black phosphorus are discussed.Five parts introduce the perform-ance of BP-based devices,including black phosphorus sandwich structure by hBN with better stability and higher mobility,black phosphorus homojunction by dual-gate structure for optical applications,black phosphorus heterojunction with other 2D materials for faster photo-detection,black phosphorus heterojunction integration with 3D bulk material,and BP via As-doping tunable bandgap enabling photo-detection up to 8.2 μm.Finally,we discuss the challenges and prospects for BP electric-al and optical devices and applications. 相似文献
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Ye Zhang Feng Zhang Yiguo Xu Weichun Huang Leiming Wu Yupeng Zhang Xiuwen Zhang Han Zhang 《Advanced functional materials》2019,29(49)
Black phosphorus (BP) has become one of the most promising materials for photoelectronic devices due to its excellent properties. However, the intrinsic instability of BP has severely hindered its practical applications. In this contribution, a hydrophobic polyionic liquid poly(1‐hexyl‐3‐vinylimidazolium) hexafluorophosphate salt (PIL‐TFSI) is applied to encapsulate BP quantum dots to form BP‐PIL for photo‐electrochemical‐type photodetector (PD) application. From both the results of experiment and density functional theory, the significantly enhanced stability of BP as well as the fluorination of BP is found. The as‐prepared PDs exhibit obviously improved photoresponse behavior (542 nA cm?2) and negligible attenuation after 90 days. In addition, the self‐healing capability can be found in the prepared PDs and the typical ON/OFF signals can still be detected after 50 cycles due to the self‐healing nature of PIL‐TFSI. It is believed that the introduction of PIL‐TFSI provides a new route for enhancing the stability of BP‐based photoelectronic devices in practical applications. 相似文献
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以包含碳纳米颗粒(CNP)的油墨、碳纳米管(CNT)和TiN纳米粒子为原料,采用高压静电喷涂技术在铝基底上沉积了CNT/CNP-TiN涂层.研究了静电电压、喷涂高度和喷涂量对涂层光吸收性能的影响.结果 表明,静电电压为9 kV、喷涂高度为30 mm和喷涂量为35μL时制备的CNT/CNP-TiN涂层光吸收性能最佳,在400～1400 nm波长范围内的平均吸收率高达97.1％.TiN纳米粒子、CNT和CNP搭建成蜂窝状团簇,团簇间形成的几百纳米到微米级的光学腔以及团簇内的几十到几百纳米的光学腔可捕获不同波段的光,拓宽吸收带宽,并通过多次反射增强吸收.此外,TiN纳米粒子、CNT和CNP具有良好的光散射效应,且大部分散射光可被光学腔捕获,进一步提高吸收率. 相似文献
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Black phosphorus (BP) has increasingly attracted scientific attention since its first applications in biomedicine due to its unique properties and excellent biocompatibility. In particular, its layer‐dependent bandgap, moderate carrier mobility, large surface‐area‐to‐volume ratio, biodegradability, intrinsic photoacoustic properties, and biocompatibility make it an ideal candidate for use in photothermal therapy, photodynamic therapy, drug delivery, 3D printing, bioimaging, biosensing, and theranostics, which are reviewed here. In addition, the article discusses strategies to overcome challenges related to surface instability due to chemical degradation, a major obstacle for its application. This review not only provides a comprehensive summary on BP preparation and biomedical applications but also summarizes recent research and future possibilities. 相似文献
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Linlin Li Depeng Wang Dong Zhang Wenhao Ran Yongxu Yan Zhexin Li Lili Wang Guozhen Shen 《Advanced functional materials》2021,31(37):2104782
The merging of humans and machines depends on the contact sensor medium used. However, this contact interaction inevitably leads to mechanical loss. Photodetectors are cutting-edge tools in optical communication that use controlled lighting to achieve efficient signal conversion to drive mechano–optical communication systems and provide an innovative interface for the Internet of Things services. Here, a self-powered, non-contact mechano–optical communication system based on a wearable Te@TeSe photodetector textile is presented, which encodes near-infrared light to modulate robotic manipulator actions. The wearable Te@TeSe photodetector textile enhanced the photocurrent and responsivity by 400 times compared to a pristine Te nanowire (NW) array. The type II heterojunction of Te@TeSe NWs is proved by first-principles calculations and simulated, providing insights on photogenic carrier transmission in Te@TeSe NWs. This system shows the possibility of duplicate real-time execution of mechanical gestures in virtual environments and paves the way for advanced optical devices applied to information transmission and mechano–optical communication. 相似文献
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以二氧化硅颗粒作为模板、金纳米颗粒作为表面晶种的方法制备了壳厚度可控的镍空心球。得到的空心镍纳米球是由似针状的面心立方的镍纳米颗粒构成的,碱溶液处理过程不影响镍纳米壳的形貌。高温处理显示镍空心球具有良好的热稳定性。研究了镍空心球电催化氧化甲醇和乙醇的活性,结果显示在碱性溶液中镍空心球是一种非常高效的甲醇和乙醇电催化氧化剂。 相似文献
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J. C. Hu P. Y. Su V. Lapeyronie S. L. Cheng M. Y. Lin L. J. Chen 《Journal of Electronic Materials》2004,33(10):1058-1063
Long-range order, uniform in size, and regular in shape two-dimensional (2-D) arrays of core-shell structure Au nanoparticles
have been synthesized. A reaction involving the displacement of the outer shells from tetraoctylammonium bromide (TOAB) to
dodecanethiol (DT) molecules was used to form Au@TOAB-DT nanoparticles at room temperature (RT). The displacement reaction
has used both superior size and shape control of Au@TOAB nanoparticles and uniform dispersion capability of Au@DT nanoparticles
to achieve an extraordinarily large in extent (3 μm×3 μm), regular nanoparticle lattice structure. From ultraviolet (UV)-visible
spectra, it was inferred that the interaction between the inner core and outer shell of Au@TOAB nanoparticles is weaker than
that of Au@TOAB-DT and Au@DT samples. As a result, the ability of the TOAB outer shell to protect the Au@TOAB nanoparticles
is weaker so that the system is more prone to agglomerate. On the other hand, the strong interactions between the inner core
and outer shell for Au@TOAB-DT and Au@DT nanoparticles led to a predominantly 2-D structure. 相似文献