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A transfer technique of stress sensors for versatile applications 一种多用途应力传感器传递技术
C. Dou, Heng Yang, Y. Wu, X. Li, Y. Wang
This paper reports a transfer process of silicon stress and Pt temperature sensors for versatile requirements. Based on a 3μm thick BCB adhesive layer, a 1.6 mm × 1.6 mm donor chip with stress and temperature sensors, which are fabricated on the silicon-on-insulator wafer using standard MEMS process, is bonded on a target wafer. After the bottom silicon layer and the insulator SiO2 layer of the donor chip are etched by XeF2 gas and RIE technique, only about 0.2μm thick top sensor layer and 0.7μm thick aluminum layer used as conducting wires and pads are transferred onto the target wafer for the measurement of its in-plane stresses. Through the transfer process of stress and temperature sensors, the in-plane stresses of the target wafer caused by the fabrication processes or the package processes can be measured.
本文报道了一种满足多用途要求的硅应力和铂温度传感器的传递过程。在3μm厚的BCB粘接层的基础上,采用标准MEMS工艺在绝缘体硅晶圆上制备了带有应力和温度传感器的1.6 mm × 1.6 mm给体芯片,并将其粘接在目标晶圆上。利用XeF2气体和RIE技术蚀刻给晶片的底部硅层和绝缘子SiO2层后,仅将约0.2μm厚的顶部传感器层和0.7μm厚的用作导线和衬垫的铝层转移到目标晶片上,用于测量其面内应力。通过应力和温度传感器的传递过程,可以测量由制造过程或封装过程引起的目标晶圆的面内应力。
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引用次数: 0
Fabrication of an ammonia microsensor based on zinc oxide 基于氧化锌的氨微传感器的制备
Ming-Zhi Yang, C. Dai
The ammonia microsensor is fabricated by the 0.35 μm complementary metal oxide semiconductor (CMOS) process. The sensor is composed of a sensitive film and polysilicon electrodes. Area of the ammonia microsensor is about 1 mm2. The sensitive film of the ammonia microsensor is zinc oxide prepared by hydrothermal method. The sensor requires a wet etching process to remove the sacrificial oxide layer and coats the zinc oxide sensitive film on the polysilicon electrodes after the CMOS process. The ammonia microsensor is resistive type. When the sensitive film absorbs or desorbs ammonia gas at room temperature, the sensitive film generates a change in resistance. Experimental results present that the sensitivity of the ammonia microsensor is about 12.6 Ω/ppm at room temperature.
该氨传感器采用0.35 μm互补金属氧化物半导体(CMOS)工艺制作而成。该传感器由敏感薄膜和多晶硅电极组成。氨微传感器的面积约为1mm2。氨微传感器的敏感膜是用水热法制备的氧化锌。该传感器需要湿蚀刻工艺去除牺牲的氧化层,并在CMOS工艺后在多晶硅电极上涂覆氧化锌敏感膜。氨微传感器为电阻式。当敏感膜在室温下吸收或解吸氨气时,敏感膜产生电阻变化。实验结果表明,在室温下,氨微传感器的灵敏度约为12.6 Ω/ppm。
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引用次数: 3
Compact multi-layer magnetic shields for chip-scale atomic devices 用于芯片级原子器件的紧凑多层磁屏蔽
L. Xuan, H. Dong, C. Zhuo
We have designed four sets of multi-layer nested magnetic shields. External diameters for the individual shielding layers range from 3.3 cm to 5.3 cm. The four sets of magnetic shields are tested by fluxgate magnetometer separately. The result of experiment is in excellent agreement with theoretical calculations. The four sets of multi-layer compact magnetic shields made of high-permeability material are compared. The largest shielding factor measured was 32.3 dB for a nested set of three cylinders (Set 2). The nested two spheres structure (Set 4) has the largest uniform region (12 mm). The nested one shell of sphere and one cylinder shell (Set 3) achieve the best trade-off between uniform region and shielding factor.
我们设计了四套多层嵌套磁屏蔽。单个屏蔽层的外径从3.3厘米到5.3厘米不等。用磁通门磁强计分别对四组磁屏蔽进行了测试。实验结果与理论计算结果非常吻合。对四组高磁导率材料制成的多层致密磁屏蔽进行了比较。嵌套三柱结构(set 2)的屏蔽系数最大,为32.3 dB。嵌套两球结构(set 4)的均匀区域最大,为12 mm。嵌套的一层球壳和一层圆柱壳(组3)实现了均匀面积和屏蔽系数的最佳权衡。
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引用次数: 2
High performance oxygen sensor utilizing ultraviolet irradiation assisted ZnO nanorods under low operation temperature 在低工作温度下,利用紫外辐照辅助ZnO纳米棒的高性能氧传感器
Chen-Shiun Chou, Yung-Chen Wu, Che-Hsin Lin
This paper presents a novel ultraviolet (UV) irradiation assisted nanostructured ZnO film for high performance oxygen sensing under a low working temperature. The UV irradiation greatly increases the number of the excited electrons to attract the high electron negativity molecule of oxygen. The response for detecting the oxidation gases can be achieved without using the high catalytic temperature. Nanorod ZnO structures with high exposing area are synthesized on a glass substrate with interdigital sensing electrodes utilizing the developed two-stage sol-gel and hydrothermal processes. An 80 mW LED with the emission wavelength of 370 nm is then used to enhance the sensing performance of the nanostructured ZnO film. Results indicate that the sensing performance of the nano ZnO oxygen sensor is greatly improved. The oxygen sensor can work at a low temperature of 50°C with the assist of UV exposure, which is much lower than the working temperature of typical solid state metal oxide sensors of around 350°C. The response of the UV-assisted ZnO film shows 4.66 times larger than the same film without UV exposure. The method developed in the present study provides a simple yet high performance method for oxygen sensing under low operation temperature.
本文提出了一种在低工作温度下紫外辐射辅助下的高性能氧传感纳米ZnO薄膜。紫外辐射大大增加了激发电子的数量,以吸引氧的高电子负性分子。检测氧化气体的响应可以在不使用高催化温度的情况下实现。采用溶胶-凝胶法和水热法在玻璃基板上合成了具有高暴露面积的ZnO纳米棒结构。然后使用发射波长为370 nm的80 mW LED来增强纳米结构ZnO薄膜的传感性能。结果表明,纳米氧化锌氧传感器的传感性能得到了很大的提高。在紫外线照射下,氧传感器可以在50°C的低温下工作,这比典型的固态金属氧化物传感器350°C左右的工作温度低得多。紫外辅助ZnO薄膜的响应比未紫外照射的ZnO薄膜大4.66倍。本研究开发的方法为低工作温度下的氧传感提供了一种简单而高性能的方法。
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引用次数: 5
Induced-transparency in silicon-on-insulator based novel resonator systems 基于绝缘体上硅的新型谐振器系统的诱导透明性
D. Cui, C. Xue, Chao Liu, Liping Wei, Yonghua Wang, Jun Liu
In the paper, Coupled-resonator-induced-transparency (CRIT) phenomenon in a novel integrated on-chip optical resonator system is experimentally demonstrated. The system is composed of a four-ring resonator with 20 μm diameter on silicon, whose spectrum has a narrow transparency peak with low group velocity. The CRIT effect is observed in the optical coupled-resonator due to the classical destructive interference. This system can be used to study the slow and fast light experiments because of its simplicity and flexibility. In this work, a CRIT resonance with a quality factor of 7.2×104 is demonstrated with the same cavity size and the power coupling of the system is 60%, which agree well with the theoretical analysis. The through and drop transmission spectra of the resonator are coincided well with each other.
本文通过实验证明了一种新型集成片上光学谐振器系统中的耦合谐振腔诱导透明现象。该系统由直径为20 μm的硅基四环谐振腔组成,其光谱具有较窄的透明峰和较低的群速度。由于经典相消干涉,在光学耦合谐振腔中观察到CRIT效应。该系统具有简单、灵活的特点,可用于慢光和快光实验的研究。本文在相同腔体尺寸下,得到了质量因子为7.2×104的CRIT谐振,系统功率耦合为60%,与理论分析相吻合。谐振器的透射谱和透射谱吻合良好。
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引用次数: 4
Controllable preparation and characterization of graphene-based cobalt oxide nanocomposites 石墨烯基氧化钴纳米复合材料的可控制备与表征
Jing Ji, K. Yin, Litao Sun
Here we introduce a facile hydrothermal synthesis for the controllable growth of cobalt oxide (Co3O4) nanoparticles onto graphene nanostructures. The Co3O4 particles were monodispersive with a grain size less than 10 nm and homogeneously anchored on graphene sheets. The effects of oxidants, reaction temperatures, and reaction times on the microstructures of final products were investigated, respectively. The obtained material was characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM).
本文介绍了一种简单的水热合成方法,用于在石墨烯纳米结构上可控地生长氧化钴纳米颗粒。Co3O4颗粒是单分散性的,粒径小于10 nm,均匀地锚定在石墨烯片上。考察了氧化剂、反应温度和反应时间对产物微观结构的影响。用透射电镜(TEM)和高分辨率透射电镜(HRTEM)对所得材料进行了表征。
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引用次数: 0
Measurement method of light transmittance of layered metal-dielectric metamaterial 层状金属-介电超材料透光率的测量方法
A. Isozaki, T. Kan, Kiyoshi Matsumoto, I. Shimoyama
We propose a measurement method of light transmittance of metamaterials by directly contacting the metamaterial on a Si photodiode. Our measurement method enables direct detection of not only the propagation wave component but also the evanescent wave component through the metamaterial. In this paper, we fabricated a layered metal-dielectric metamaterial composed of Ag/Al2O3 layers on the Si photodiode. The transmittance property of evanescent wave was measured. This result indicates that our measurement system detects evanescent wave transferred through the fabricated metamaterial.
提出了一种通过直接接触硅光电二极管上的超材料来测量超材料透光率的方法。我们的测量方法不仅可以直接检测传播波分量,还可以通过超材料直接检测倏逝波分量。本文在硅光电二极管上制备了一种由Ag/Al2O3层组成的层状金属介电材料。测量了倏逝波的透射特性。这一结果表明,我们的测量系统可以检测到通过所制备的超材料传递的倏逝波。
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引用次数: 0
Electrical properties of micro-heaters using sputtered NiCr thin film 溅射NiCr薄膜微加热器的电学性能
Ting Wu, Jingquan Liu, Shui-Dong Jiang, Bin Xu, Bin Yang, Hongying Zhu, Chunsheng Yang
NiCr (80/20 at.%) thin films were deposited on SiO2/Si substrates as a cryonetic heater by DC magnetron sputtering technique. After a series of annealing treatments under various conditions, the electrical properties and microstructure of the films were investigated. The crystallinity and composition of the films were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The films are changed from crystalline to amorphous phase after annealing at 250°C in nitrogen ambient and the annealing conditions have a significant effect on the resistivity and temperature coefficient of resistance (TCR) of the films. TCR of the samples annealed at 250°C for 9 minutes in N2 shows 9.23 ppm/K at 20K which is finally confirmed as the optimal result.
采用直流磁控溅射技术将NiCr (80/20 at.%)薄膜作为低温加热器沉积在SiO2/Si衬底上。在不同条件下进行一系列退火处理后,研究了薄膜的电学性能和微观结构。采用x射线衍射仪(XRD)和扫描电镜(SEM)对膜的结晶度和组成进行了分析。在氮气环境中250℃退火后,薄膜由结晶变为非晶态,退火条件对薄膜的电阻率和电阻温度系数(TCR)有显著影响。在N2中250℃退火9 min后,样品的TCR在20K时为9.23 ppm/K,最终确定为最佳结果。
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引用次数: 3
Study on trapping two particles with dielectrophoretic microfluidic chip 介电泳微流控芯片捕获二粒子的研究
Liguo Chen, Hai-hang Cui, Shaoqian Li
In microfluidic field, how to capture, manipulate and separate micro-particles suspended in liquid media has very important applications. Up to now, only seldom works focused on how to trap two particles with different sizes. In order to achieve this goal, a dielectrophoretic microfluidic chip was designed. The shape of electrode and flow channel was optimized; the electric field and the flow field were simulated. At last, the chip was fabricated to verify the design. The results show that the chip is able to realize the function of pairing two particles with different sizes.
在微流控领域,如何捕获、操纵和分离悬浮在液体介质中的微颗粒具有非常重要的应用。到目前为止,很少有研究关注如何捕获两个不同大小的粒子。为了实现这一目标,设计了介电泳微流控芯片。优化了电极形状和流道;对电场和流场进行了模拟。最后制作了芯片,验证了设计的正确性。实验结果表明,该芯片能够实现不同粒径颗粒的配对功能。
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引用次数: 0
Fabrication of stable silver nanoparticles through a green approach 通过绿色方法制备稳定的银纳米颗粒
Wenbin Li, Cheng Wang, Wei Zhang, Weixiang Ye, Shun Huang, Zhao Yue, Guohua Liu
We had suggested a novel method for the synthesis of silver nanoparticles by suitable choice of materials and solvents. It was a green, straight forward method in an aqueous medium. Additionally, nontoxic reagents were used in the experiment and the process was environmentally friendly. This green approach needs three reagents (dextran, tollens' reagent, glucose) which come from renewable resources. The effects of the concentration of tollens' reagent on silver nanoparticles formation and storage stability were studied. The silver nanoparticles were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and UV-vis spectroscopy. The results indicated that the reaction parameters significantly affected the size, formation rate and distribution of the silver nanoparticles. This method is simple and economical therefore may be practical for large-scale synthesis.
我们提出了一种通过选择合适的材料和溶剂来合成纳米银的新方法。这是一种在水介质中使用的绿色、直接的方法。此外,实验中使用了无毒试剂,过程是环保的。这种绿色方法需要三种来自可再生资源的试剂(葡聚糖、托伦试剂、葡萄糖)。研究了托伦斯试剂浓度对银纳米粒子形成和储存稳定性的影响。采用透射电子显微镜(TEM)、能谱仪(EDS)和紫外可见光谱(UV-vis)对纳米银进行了表征。结果表明,反应参数对银纳米粒子的尺寸、形成速率和分布有显著影响。该方法简单、经济,可用于大规模合成。
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引用次数: 3
期刊
The 8th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems
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