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A synthetic strategy of quantum dot-bioconjugate 量子点-生物偶联物的合成策略
Pub Date : 2010-12-13 DOI: 10.1109/INEC.2010.5424726
Qiangbin Wang, Hao Yan, D. Seo
Quantum dots (QDs) have attracted tremendous interest in biological applications, such as bioimaging, biolabeling, and biosensing, because of their advantages over organic fluorophores at high quantum yield (QY), size-tunable narrow emission, photostability, etc. To date, various strategies have been developed to obtain water-soluble QDs and QD bioconjugates, but these commonly require multiple steps to obtain the final products. Herein, we present a simple and robust one-step method for creating stable, water-soluble QD and QD-biomolecule conjugates. We demonstrate the successful implementation of this strategy by using mercaptopropyl acid and DNA molecules as model systems, but expect this could also be extended to other types of biomolecules.
量子点在生物成像、生物标记和生物传感等领域的应用引起了人们的极大兴趣,因为量子点具有高量子产率、可调谐窄发射、光稳定性等优点。迄今为止,已经开发了各种策略来获得水溶性量子点和量子点生物偶联物,但这些通常需要多个步骤才能获得最终产品。在此,我们提出了一种简单而稳健的一步方法来创建稳定的水溶性量子点和量子点生物分子偶联物。我们通过使用巯基丙酸和DNA分子作为模型系统证明了这一策略的成功实施,但期望这也可以扩展到其他类型的生物分子。
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引用次数: 0
Mechanical and electrical properties of Cu-Ag nanocomposites processed by equal channel angular pressing (ECAP) 等通道角压Cu-Ag纳米复合材料的力学和电学性能
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424899
Kyu-Jin Cho, S. Hong
Equal channel angular pressing was carried out on Cu-Ag composites at room temperature. ECAPed Cu-Ag exhibited ultrafine structure with the shape and distribution of Ag phase dependent on the processing routes. In route A, the initial lamellae of Ag phase were elongated along the shear direction and developed into filaments whereas the initial lamellae became finer by fragmentation with no pronounced change of the shape in route Bc. The hardness of ECAPed Cu-Ag is greater than that of ECAPed Cu. The higher hardness in Cu-Ag is ascribed to the more effective matrix strengthening due to the dislocation storage at the interface and the precipitation hardening. The hardness of ECAPed Cu-Ag was lower than the drawn Cu-Ag at the same deformation strain because of the less effective refinement and elongation of the two-phase filamentary microstructure. The application of ECAP in Cu-Ag was found to be effective in the modification of structure, shape and distribution of phases in composite and the increase of the strength.
在室温条件下对Cu-Ag复合材料进行了等通道角挤压。eced Cu-Ag呈现超细结构,Ag相的形状和分布随工艺路线的不同而不同。在A路线中,Ag相的初始薄片沿剪切方向被拉长并发育成细丝,而在Bc路线中,初始薄片被破碎而变得更细,形状没有明显变化。eced Cu- ag的硬度大于eced Cu的硬度。Cu-Ag中较高的硬度是由于界面处的位错储存和析出硬化使基体得到了更有效的强化。在相同变形应变下,eced Cu-Ag的硬度低于拉制Cu-Ag,这是由于两相丝状组织细化伸长率较低。在Cu-Ag复合材料中应用ECAP可以有效地改变复合材料的结构、形态和相分布,提高复合材料的强度。
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引用次数: 0
Enhanced UV lasing emission from ZnO-MgO core-shell structure ZnO-MgO核壳结构增强紫外激光发射
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424706
H. Yang, S. Yu, T. Wu
We investigate the effect of modification of ZnO nanorods surfaces with amorphous MgO layer on the lasing emission from ZnO nanorods.
研究了用无定形氧化镁层修饰ZnO纳米棒表面对ZnO纳米棒激光发射的影响。
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引用次数: 0
Preparation of silicon nanowire arrays via electroless metal deposition 化学金属沉积法制备硅纳米线阵列
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424540
Xuan Liu, Qingsong Hu
Large-area silicon nanowire arrays are prepared successfully with mixed AgNO3 and HF solution by EMD method at normal temperature and pressure. It has been proved the best equality of silicon nanowires can be obtained at the concentration ratio of 0.02 mol/l: 5mol/l for AgNO3 and HF and 1h reaction time. The influence of nano metal particles on the growth, the wire diameter, the distribution and the array of silicon nanowires are analyzed. Experimental results show the distribution and wire diameter of silicon nanowires can be controlled effectively by nano metal particles deposited on silicon wafers, and the equality of silicon nanowires with nano Au particles are better than those with nano Pt particles. The reaction mechanism of preparing large-area silicon nanowire arrays is analyzed as the result of the deoxidization of Ag+ and the removal of the oxidized Si solution by reacting with HF.
在常温常压下,以AgNO3和HF溶液为原料,采用EMD法制备了大面积硅纳米线阵列。实验证明,当AgNO3和HF的浓度比为0.02 mol/l: 5mol/l,反应时间为1h时,硅纳米线的均匀性最好。分析了纳米金属颗粒对硅纳米线生长、线径、分布和排列的影响。实验结果表明,在硅片上沉积纳米金属颗粒可以有效地控制硅纳米线的分布和线径,且纳米Au纳米线的均匀性优于纳米Pt纳米线。分析了制备大面积硅纳米线阵列的反应机理,通过与HF反应还原Ag+,去除氧化后的Si溶液。
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引用次数: 1
Microstructure and thermal properties of phase change (GeSbSn)100-xCox optical recording films 相变(GeSbSn)100-xCox光记录薄膜的微观结构和热性能
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424938
S. Ou, P. Kuo, S. Ma, C. Shen, W. Tang, D. Chiang, C. Lee
In this study, the (GeSbSn)100-xCox films (x = 0 ∼ 13.3) were deposited on natural oxidized silicon wafer and glass substrate by dc magnetron co-sputtering of GeSbSn and Co targets. The thicknesses of the (GeSbSn)100-xCoxfilms and protective layer were 100 nm and 30 nm, respectively. The phase transition temperatures of (GeSbSn)100-xCox films are decreased with Co content. It is found that the activation energy of the (GeSbSn)100-xCox films will decrease from 1.53 eV to 0.55 eV as Co content increased from 0 at.% to 13.3 at.%.
在本研究中,通过直流磁控溅射GeSbSn和Co靶材,在天然氧化硅片和玻璃衬底上沉积了(GeSbSn)100-xCox薄膜(x = 0 ~ 13.3)。制备的(GeSbSn)100- xcox薄膜厚度为100 nm,保护层厚度为30 nm。(GeSbSn)100-xCox膜的相变温度随Co含量的增加而降低。结果表明,随着Co含量从0 at增加,(GeSbSn)100-xCox膜的活化能从1.53 eV降低到0.55 eV。%至13.3%。
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引用次数: 0
Piezomagnetic properties and shielding properties of amorphous and nanocrystalline powders / butyl rubber composite films 非晶和纳米晶粉末/丁基橡胶复合薄膜的压磁性能和屏蔽性能
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424766
X. Xu, Zhenghou Zhu, Huizong Song, Zhenzhen Wan, H. Peng, Junfu Huang
The composite films of amorphous and nanocrystalline Fe73.5Cu1Nb3Si13.5B9 powders/butyl rubber were prepared by pressing in the mold to shape. The piezomagnetic properties of composite films were studied in the temperature range of 20–50 Celsius degree with theshielding properties in the frequency band (30kHz–6000MHz) of electromagnetic wave. The results show that when the microstress below 0.09MPa and testing frequency below 200kHz, the piezomagnetic properties are the best and theirs piezomagnetic properties increase as temperatures increase, the piezomagnetic properties of amorphous composite films are the best at 40 Celsius degree. Within frequency band (30kHz–6000MHz) of electromagnetic wave, the films have good characteristics of shielding high-frequency and broad-frequency electromagnetic waves. The shielding properties are improved significantly as the content of powder or the thickness of materials increases. Shielding effectiveness above 15dB is obtained at certain experimental parameters.
采用模压成形的方法制备了非晶和纳米晶Fe73.5Cu1Nb3Si13.5B9粉末/丁基橡胶复合薄膜。研究了复合薄膜在20 ~ 50℃温度范围内的压磁性能,并对电磁波频段(30khz ~ 6000mhz)的屏蔽性能进行了研究。结果表明:当微应力低于0.09MPa,测试频率低于200kHz时,非晶复合膜的压磁性能最好,且随温度升高而升高,其中在40℃时,非晶复合膜的压磁性能最好。在电磁波的频段(30kHz-6000MHz)内,薄膜具有良好的屏蔽高频和宽频电磁波的特性。随着粉末含量的增加或材料厚度的增加,屏蔽性能得到明显改善。在一定的实验参数下,获得了15dB以上的屏蔽效能。
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引用次数: 0
Hybrid inorganic-organic films with Benzaldehyde-based chromophore for electro-optic device 电光器件用苯甲醛基发色团无机-有机杂化薄膜
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424687
Yuanjing Cui, Jingting Hu, Jiancan Yu, Jing-Shen Qiu, Liying Liu, Lei Xu, G. Qian
A novel alkoxysilane-functionalized push-pull chromophore was synthesized through a coupling reaction between a benzaldehyde-based chromophore, 4-aldehyde-4'-(N-ethyl-N-2-hydroxyethyl aminoazobenzene (BA) and 3-isocyanatopropyltriethoxysilane (ICTES). Followed by a hydrolysis and condensation process of the resultant alkoxysilane dye and tetraethoxysilane (TEOS), hybrid inorganic-organic materials were obtained. The hybrid materials exhibited excellent film homogeneity and optical clarity. Molecular structural and physical properties were characterized by FTIR, NMR, UV-vis spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. Second harmonic generation and electro-optic modulation studies were also conducted on this material.
以苯甲醛为基色团,4-醛-4′-(n -乙基- n -2-羟乙基氨基偶氮苯(BA)和3-异氰基丙基三乙基氧基硅烷(ICTES)为偶联反应合成了一种新型的烷氧基硅烷功能化推拉色团。将合成的烷氧基硅烷染料和四乙氧基硅烷(TEOS)进行水解缩合,得到了无机-有机杂化材料。该杂化材料具有良好的薄膜均匀性和光学清晰度。采用红外光谱、核磁共振、紫外可见光谱、热重分析和差示扫描量热法对分子的结构和物理性质进行了表征。对该材料进行了二次谐波产生和电光调制的研究。
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引用次数: 1
The valence charge polarization induced by the shorter and stronger bonds between under-coordinated gold atoms 低配位金原子间较短较强的键引起的价电荷极化
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424627
Xi Zhang, J. Kuo, M. Gu, Xiaofeng Fan, P. Bai, Q. Song, C. Q. Sun
Relativistic density functional theory calculations have been conducted to examine the effect of atomic under-coordination. The calculated results agree exceedingly well with experimental observations: skin-depth bond contraction, chain end stats polarization, potential well depression, core level shift, and the valence charge polarization of gold nanostructures. Consistency between calculations and experimental observations affirms the prediction of the bond-order-length-strength (BOLS) correlation theory [Sun CQ, Phys Rev B 69, 045105 (2004)], asserting that the under-coordinated surface atoms are indeed associated with local strain, quantum trap depression, charge densification and valence charge polarization and that the locally polarized and pinned electrons are responsible for the metal-insulator transition and magnetism present of gold nanoparticles.
用相对论密度泛函理论计算了原子欠配位的影响。计算结果与实验结果吻合得非常好:金纳米结构的键深收缩、链端状态极化、势阱下降、核心能级移动和价荷极化。计算与实验观测的一致性证实了键序-长度-强度(BOLS)相关理论的预测[Sun CQ, Phys Rev B 69, 045105(2004)],断言低配位表面原子确实与局域应变、量子阱抑制、电荷致密化和价电荷极化以及局部极化和钉住电子是金纳米粒子的金属-绝缘体跃迁和磁性存在的原因。
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引用次数: 0
Characterization of multiferroic thin films directly deposited on silicon for novel device applications 直接沉积在硅上的多铁薄膜在新型器件中的应用
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5425138
K. Prashanthi, V. Palkar
we have investigated the multiferroic and dielectric properties in Dy modified BiFeO3 thin films deposited directly on silicon using pulsed laser deposition (PLD) technique. The results support the usability of these films in multiferroic based MEMS devices as well as gate dielectrics for future CMOS applications.
利用脉冲激光沉积(PLD)技术研究了直接沉积在硅上的Dy修饰BiFeO3薄膜的多铁性和介电性。这些结果支持这些薄膜在基于多铁性的MEMS器件以及未来CMOS应用的栅极介质中的可用性。
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引用次数: 0
Fabrication and characterization of twin poly-Si thin film transistors EEPROM with nitride trapping layer 带氮化物捕获层的双多晶硅薄膜EEPROM的制备与表征
Pub Date : 2010-03-04 DOI: 10.1109/INEC.2010.5424704
Yung-Chun Wu, Min-Feng Hung, Ji-Hong Chiang, Lun-Jyun Chen, Chiang-Hung Chen
This work demonstrates a novel twin poly-Si thin film transistor (TFT) EEPROM that utilizes oxide for gate dielectric and nitride for electron trapping layer (O/N twin poly-Si EEPROM). This EEPROM has superior reliability because its nitride for electron trapping layer provides a better program/erase efficiency and retention. For endurance and retention, the memory window can be maintained 2.5 V after 103 program and erase (P/E) cycles, and the memory window can be maintained 2.5 V after 104 s at 85 °C. This investigation explores its feasibility in future active matrix liquid crystal display (AMLCD) system-on-panel (SOP) and 3D stacked Flash memory applications.
这项工作展示了一种新型的双多晶硅薄膜晶体管(TFT) EEPROM,它利用氧化物作为栅极介电介质,氮化物作为电子捕获层(O/N双多晶硅EEPROM)。该EEPROM具有优异的可靠性,因为其电子捕获层的氮化物提供了更好的程序/擦除效率和保留。为了延长寿命和保持时间,在103个程序和擦除(P/E)周期后,记忆窗口可维持2.5 V,在85℃下,记忆窗口可维持104 s后的2.5 V。本研究探讨其在未来有源矩阵液晶显示(AMLCD)面板系统(SOP)及3D堆叠快闪记忆体应用的可行性。
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引用次数: 0
期刊
2010 3rd International Nanoelectronics Conference (INEC)
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