固体电解质电位型CO气体传感器的研究

以NASICON(钠超离子导体)固体电解质为离子导电层,Y2O3为敏感电极研制了一种用于测定CO的电化学气体传感器.结果表明,器件对(5～50)×10-6范围内的CO具有较好的敏感特性.在400℃下,器件对CO的灵敏度为-45 mV/decade.并且器件对CO具有较高的选择性和良好的响应恢复特性.     

Design of small-area and high-efficiency DC-DC converter for 1 T SRAM

The direct current-direct current (DC-DC) converter is designed for 1 T static random access memory (SRAM) used in display driver integrated circuits (ICs), which consists of positive word-line voltage (V _PWL), negative word-line voltage (V _NWL) and half-V _DD voltage (V _HDD) generator. To generate a process voltage temperature (PVT)-insensitive V _PWL and V _NWL, a set of circuits were proposed to generate reference voltages using bandgap reference current generators for respective voltage level detectors. Also, a V _PWL regulator and a V _NWL charge pump were proposed for a small-area and low-power design. The proposed V _PWL regulator can provide a large driving current with a small area since it regulates an input voltage (VCI) from 2.5 to 3.3 V. The V _NWL charge pump can be implemented as a high-efficiency circuit with a small area and low power since it can transfer pumped charges to V _NWL node entirely. The DC-DC converter for 1 T SRAM were designed with 0.11 μm mixed signal process and operated well with satisfactory measurement results.     

BaTiO_3对SnO_2基CO气敏元件性能影响

通过掺入BaTiO3来调整SnO2基CO气敏元件的温度系数,进而改善气敏元件的长期稳定性。元件的各种性能与BaTiO3的性质和含量密切相关。当掺入质量分数为2%的含YCl3摩尔分数为0.4%的BaTiO3时,元件的烧结温度升高,抗酒精的干扰能力增强,元件的长期稳定性得到了改善。     

CO2传感器的制作及特性

采用高温固相反应法制备了Na超离子导体（NASICON）的固体电解质材料，用IR技术分析了不同合成温度下制备的NASICON材料的基本性质。用所制得的NASICON材料制作了具有较高灵敏度和选择性的CO2气体传感器。     

高分子感湿膜的感湿特性

以国产材料(A)和日本进口材料(B)合成的高分子材料作感湿膜,制作了高分子湿敏器件,均具有良好的感湿特性。增涂乙基纤维素保护膜,有使(A)器件湿滞回差变大,(B)器件湿滞回差变小的趋势。浸水时间不当均可使两种器件的湿滞回差变大,因此合理控制浸水时间是必要的。     

WO3中的掺杂及其气敏特性

在ＷＯ３微粉料中掺入１ｗｔ％的不同金属氧化物或金属盐，使ＷＯ３的气敏性能明显变化，掺入Ｔｈ＾＝４，Ｃｄ＾＋４，Ｌｉ＾＋１，Ａｇ＾＋１等可提高对Ｈ２Ｓ的灵敏度，掺入Ｒ＾＋３，Ｔｈ＾＋４，Ｃｅ＾＋４等可增加对乙醇等气体的灵敏性，而对Ｈ２，ＣＯ，ＣＨ４，Ｃ４Ｈ１０等不敏感，而且具有良好的响应恢复特性。     

WO3材料对H2S气体的敏感特性

采用钨酸钠盐酸热分解法制备的ＷＯ３微粉对Ｈ２Ｓ气体具有良好的气敏性能。对０－１００ppmH2S灵敏度与Ｈ２Ｓ呈现良好的线性，并具有快速响应和恢复的特点。     

新型结构CO2传感器的研究

介绍了一种新型管式结构固体电解质CO2传感器。该传感器是将溶胶–凝胶法制备的NASICON材料均匀涂敷在Al2O3陶瓷管上,烧结形成厚膜,加热丝穿过管内提供热量。在加热电流为180 mA,CO2浓度为(200~2000)?06时,管式元件灵敏度曲线的斜率达到60,比同电流下平面型元件的斜率高出14.2。35 d内,管式元件在1 000?06浓度下的漂移值为8.8 mV,与平面型元件的漂移值11.3 mV相比,显示了较好的稳定性。     

Design of 512-bit logic process-based single poly EEPROM IP

A single poly EEPROM cell circuit sharing the deep N-well of a cell array was designed using the logic process. The proposed cell is written by the FN tunneling scheme and the cell size is 41.26 μm², about 37% smaller than the conventional cell. Also, a small-area and low-power 512-bit EEPROM IP was designed using the proposed cells which was used for a 900 MHz passive UHF RFID tag chip. To secure the operation of the cell proposed with 3.3 V devices and the reliability of the used devices, an EEPROM core circuit and a DC-DC converter were proposed. Simulation results for the designed EEPROM IP based on the 0.18 μm logic process show that the power consumptions in read mode, program mode and erase mode are 11.82, 25.15, and 24.08 μW, respectively, and the EEPROM size is 0.12 mm².     

Nb-In复合氧化物氯气传感器的研制

以In(NO3)3、Nb2O5、氨水为原料,采用化学沉淀法制备了不同Nb-In比的复合氧化物纳米材料.通过不同温度(500℃-800℃)烧结得到了不同的Nb-In复合氧化物材料.利用X射线衍射仪对材料的晶体结构进行了表征并估算粒径大小.利用这种材料制备管式厚膜气体传感器.研究表明,元件在温度为100℃时对50×10-6Cl2表现出较高的灵敏度(7 900)和较好的选择性,元件对Cl2的检测下限为0.2×10-6,加热功率为130 mW.最后,对其敏感机理进行了分析.