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氧化锌空心球的制备及其气敏性能研究 总被引:2,自引:0,他引:2
以新制的碳球为模板在溶液相中制备了氧化锌空心球,并制成气敏元件,进行了气敏性能测试。结果表明,氧化锌空心球气敏元件对乙醇、丙酮和三乙胺有很好的敏感性。尤其是对三乙胺和乙醇分别在175℃和400℃表现出高的灵敏度和快的响应特性。 相似文献
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一维氧化锌的水热合成及其气敏性能的研究 总被引:2,自引:0,他引:2
Zn(NO3)2为原料,CTAB为形貌控制剂, 采用水热合成技术制备了一维氧化锌粉体. 采用X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)等测试技术对产物的相组成和微观形态进行了表征和分析, 结果表明一维氧化锌属于六方晶系, 分散性好, 纯度高, 直径~200nm, 长度~5μm. 用该粉体制成烧结型旁热式气敏元件, 测试其气敏性能. 结果表明, 在170℃左右对10ppm的三甲胺、甲醇等还原性气体有很好的响应. 文中对一维材料的气敏机理也进行了讨论. 相似文献
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采用水热法,以油酸为形貌控制剂,硝酸铝为铝源,制备了氧化锌掺杂铝纳米片,对其进行了XRD、SEM和EDS表征。考察了制备物对甲醇、乙醇、丙酮、异丙醇、正丁醇、DMF等六种气体的气敏性能,并对其气敏机理进行了简要分析。结果表明,掺杂3%Al的ZnO样品晶粒尺寸变小,为带微孔的层状纳米片,EDS能谱表明样品含有Zn、O和Al元素。样品对正丁醇、丙酮的灵敏度较高,100ppm时分别为164和70,对丙酮的响应和恢复时间分别为7s和29s。 相似文献
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ZnO气敏陶瓷的制备与气敏性能研究 总被引:17,自引:2,他引:15
分别用氨水、草酸铵、尿素和碳酸钠做沉淀剂合成了4种不同陶瓷微结构的ZnO气敏材料。用X射线衍射(XRD),透射电子显微镜(TEM)和电子衍射(ED)法研究了其晶体和陶瓷微结构。采用静态配气法测试了其气敏效应。ZnO陶瓷具有四方和六方2种不同的结晶外形,颗粒尺寸为0.1~4μM。ZnO陶瓷对C_2H_5OH具有较好的气敏选择性,通过SnO_2的掺杂,ZnO对C_2H_5OH的选择性可进一步提高。颗粒微细化有助于提高ZnO的气体灵敏度。 相似文献
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以硝酸锌和氨水为反应物,采用沉淀法制备ZnO纳米粉体.通过X射线衍射仪和透射电镜对其进行分析,结果表明,制得的ZnO颗粒为球形,粒径较小,在20nm左右,为六方形纤锌矿结构.通过掺杂In2O3,大大提高元件对氯气的气敏特性.实验表明,该元件对体积分数为20×10-6的氯气,灵敏度可达301,响应时间2秒,恢复时间在110秒左右,具有高选择性. 相似文献
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铁氧化物薄膜气敏材料的制备及性能研究评述 总被引:4,自引:0,他引:4
本文综合介绍近年来在铁氧化物薄膜所敏材料制备方法、性能方面的研究新进展,探讨了各种方法的特点。提出了今后铁氧化物气敏传感器的研究及改进方向。 相似文献
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Pure and Pd-doped ZnO nanofibers were synthesized by electrospinning method, and characterized via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The diameters of the fibers annealed at 600 °C range from 70 to 160 nm. Compared with pure ZnO nanofiber sensor, the Pd-doped ZnO nanofiber sensor exhibits improved sensing properties to CO at 220 °C. Moreover, this sensor processes considerable sensitivity to low concentration CO in the range of 1-20 ppm with good selectivity. The response and recovery times are in the range of 25-29 s and 12-17 s, respectively. The sensing mechanism is also discussed. 相似文献
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利用大气开放式MOCVD在氧化铝基片上沉积ZnO薄膜,研究了沉积工艺参数对薄膜形貌的影响,结果表明基片温度对ZnO薄膜的晶体形貌有显著的影响,在一定的条件下能够沉积出具有高比表面积花瓣片层结构的ZnO薄膜。以酒精蒸气为例,研究了ZnO薄膜对碳氢有机化合物气体的气敏特性,结果表明结晶度高且晶粒细小、比表面积高的薄膜具有较好的气敏特性。 相似文献
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以Zn(NO3)2.6H2O和聚乙二醇(PEG,Mn=2000)为原料,采用微波水热法制备出了结晶性能良好的ZnO微球。利用XRD、EDS、SEM、TEM对样品进行了表征,并系统研究了微波水热过程中辐照时间、水热温度、表面活性剂和超声处理等因素对产物形貌和结构的影响。实验表明,ZnO微球是由很多直径约300nm,长1μm的ZnO棒自组装而成,微球直径约为2μm,自组装结构的形成可能与PEG模板的导向作用有关。延长微波辐照时间,ZnO微球的直径有所增加,微球结构的完整性受微波水热温度影响较大。 相似文献
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A. Santhoshkumar Helen P. Kavitha R. Suresh Jasmine P. Venila S. Praveen Kumar V. Narayanan 《Journal of Materials Science: Materials in Electronics》2017,28(13):9272-9278
In this paper reports a facile hydrothermal synthesis, characterization and sensing application of zinc oxide (ZnO) nanostructures. ZnO nanostructures were synthesized by mixing triethylamine (TEA) with zinc nitrate at 60?°C followed by calcination at 650?°C for 6 h. The detailed characterizations conformed the synthesized ZnO nanostructures. Powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and Raman spectral analysis confirmed the formation of hexagonal ZnO. Band gap of the ZnO nanoparticles was determined by UV–visible absorption spectroscopy. Morphology and size of the sample was examined by field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM). It shows that the sample has rod and hexagonal morphology. Elemental composition was determined by energy dispersive X-ray (EDX) spectroscopy. The ZnO was coated on glassy carbon electrode (ZnO/GCE) and it was utilized as an electrochemical sensor for 4-nitrophenol (4-Np). Sensitivity and detection limit of ZnO/GCE towards 4-Np was found to be 0.04 µA/mM and 2.09?×?10?5 M. The result suggests that ZnO has suitable sensor detection of 4-Np. 相似文献
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Seongcheol Mun Hyun Chan Kim Hyun-U Ko Lindong Zhai Jung Woong Kim 《Science and Technology of Advanced Materials》2013,14(1):437-446
AbstractThis paper reports the synthesis and UV sensing characteristics of a cellulose and ZnO hybrid nanocomposite (CEZOHN) prepared by exploiting the synergetic effects of ZnO functionality and the renewability of cellulose. Vertically aligned ZnO nanorods were grown well on a flexible cellulose film by direct ZnO seeding and hydrothermal growing processes. The ZnO nanorods have the wurtzite structure and an aspect ratio of 9 ~ 11. Photoresponse of the prepared CEZOHN was evaluated by measuring photocurrent under UV illumination. CEZOHN shows bi-directional, linear and fast photoresponse as a function of UV intensity. Electrode materials, light sources, repeatability, durability and flexibility of the prepared CEZOHN were tested and the photocurrent generation mechanism is discussed. The silver nanowire coating used for electrodes on CEZOHN is compatible with a transparent UV sensor. The prepared CEZOHN is flexible, transparent and biocompatible, and hence can be used for flexible and wearable UV sensors. 相似文献
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水热法制备不同形貌的氧化锌纳米结构 总被引:2,自引:1,他引:1
采用水热法,用甲酰胺水溶液和锌片建立反应体系,在不同种晶层上制备出不同形貌的ZnO纳米结构,所用基底有Si片、镀有ZnO薄膜的Si片、镀有ITO薄膜的Si片、涂有ZnO粉末的Si片等,研究了不同的种晶层对ZnO纳米结构的形貌的影响。在不同温度下,分别在镀有ZnO薄膜和ITO薄膜的医用载玻片衬底上生长ZnO纳米结构,研究了温度在水热法中的作用及种晶层对纳米杆长度的影响。实验中用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对纳米聚集体进行了表征。SEM表征结果表明不同种晶层上获得的ZnO纳米结构形貌差异很大;反应时间、甲酰胺水溶液浓度以及反应温度对ZnO纳米阵列形貌都有着一定的影响;在ZnO薄膜上生长的纳米杆较在ITO薄膜上生长的纳米杆长。SEM图像同时表明氧化锌纳米杆随着温度的增大,纳米杆的长度和杆径增大。X射线衍射峰在34.6℃有很强的(002)纤锌矿衍射峰,该峰表明衬底上有高度c轴取向的大面积纳米杆阵列和较好的结晶质量。 相似文献
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ZnO nanorods are prepared by a hydrothermal process with cetyltrimethylammonium bromide (CTAB) and zinc powder at 182°C. The samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The gas sensing properties of the materials have been investigated. The results indicate that the as-prepared ZnO nanorods are uniform with diameters of 40–80 nm and lengths about 1 μm, the relatively high sensitivity and stability of these sensors made from ZnO nanorods demonstrate the potential for developing a new class of stable and very sensitive sensors. 相似文献