共查询到20条相似文献,搜索用时 15 毫秒
1.
《计算机与应用化学》2015,(6)
采用水热法合成了孪连柱状ZnO纳米粉体,通过X射线衍射仪(XRD)、扫描电镜(SEM)、红外光谱仪(IR)和X-射线光电子能谱仪(XPS)等对产物的物相、微观形貌、表面化学键及化学组分进行了表征与分析,并用静态配气法测试了其厚膜型元件的气敏性质,结果表明,产物属于纤锌矿型六方晶系的ZnO,平均直径约300 nm,长约500 nm,其厚膜型元件在工作温度为395℃时对体积分数为100×10-6乙醇和丙酮气体能快速响应,灵敏度分别达到了14.4和29.4,特别是对丙酮气体具有较好的选择性。 相似文献
2.
K.V. GuravAuthor VitaeP.R. DeshmukhAuthor Vitae C.D. LokhandeAuthor Vitae 《Sensors and actuators. B, Chemical》2011,151(2):365-369
One-dimensional (1-D) vertically aligned ZnO nanorods are synthesized on glass substrate through a simple chemical route and their liquefied petroleum gas (LPG) sensing properties are studied. The morphology and structure of vertically aligned ZnO nanorods has been characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The LPG sensing properties of the vertically aligned ZnO nanorods are improved significantly after palladium (Pd) sensitization. The unsensitized vertically aligned ZnO nanorods exhibited the maximum response of 37% at 573 K upon exposure to 2600 ppm LPG, which improved to 60% at operating temperature of 498 K after the Pd sensitization. The Pd-sensitized vertically aligned ZnO nanorods showed more selectivity towards LPG as compared to CO2. Our results demonstrate that the chemically grown vertically aligned ZnO nanorods along with Pd sensitization are promising material for the fabrication of cost effective and high performance gas sensors. 相似文献
3.
Sang Kyoo Lim Sung-Ho Hwang Soonhyun Kim Hyunwoong ParkAuthor vitae 《Sensors and actuators. B, Chemical》2011,160(1):94
Zinc oxide nanorods with different surface area were synthesized by surfactant assisted microemulsion method. The alkyl chain length of surfactant would affect aspect ratio of ZnO nanorods. ZnO nanorods synthesized by ethyl benzene acid sodium salt (EBS), which is surfactant with short alkyl chain length, show higher aspect ratio than ones by dodecyl benzene sulfonic acid sodium salt (DBS). These nanorods had diameters in the range of 80–300 nm and length of up to several microns. The Brunauer–Emmett–Teller (BET) surface area of the ZnO nanorods was strongly affected by the morphology of the nanorods. The BET surface area of the nanorods synthesized with EBS was higher than the surface area of the nanorods synthesized with DBS (20.2 and 14.1 m2/g for EBS and DBS, respectively). The response of ZnO nanorods to CO in air was strongly affected by surface area, defects and oxygen vacancies. The results demonstrate that the microemulsion synthesis is an easy and useful method to synthesize ZnO nanorods with large aspect ratio, which may enhance their gas sensing properties. 相似文献
4.
Lexi ZhangAuthor Vitae Jianghong ZhaoAuthor Vitae Jianfeng ZhengAuthor VitaeLi LiAuthor Vitae Zhenping ZhuAuthor Vitae 《Sensors and actuators. B, Chemical》2011,158(1):144-150
Nanoparticle-decorated ZnO microdisks showing a hierarchical structure were successfully synthesized through a citric acid-assisted hydrothermal process. The ZnO microdisks had a hexagonal wurtzite structure with high crystallinity. Sensors based on these microdisks exhibited high response values, fast response-recovery, good selectivity and long-term stability to 1-4000 ppm acetylene at 420 °C. In addition, even 1 ppm acetylene can be detected with high response (S = 7.9). The hierarchical structure can facilitate to fix the ZnO nanoparticles leading to a less aggregated configuration, which is expected to contribute much to the excellent acetylene sensing properties at high temperatures. 相似文献
5.
Peng Sun Yingshuo Yu Jing Xu Yanfeng Sun Jian Ma Geyu Lu Author vitae 《Sensors and actuators. B, Chemical》2011,160(1):244
The hierarchical unloaded and Pd-loaded SnO2 nanostructures, consisting of many aggregative nanorods were prepared by one-step hydrothermal method. A possible formation mechanism of these hierarchical structures was proposed. The butanone sensing properties of the sensors based on unloaded and hierarchical Pd-loaded SnO2 nanorods were investigated. The results indicate that the response of sensor using hierarchical Pd-loaded SnO2 nanorods to 1000 ppm butanone was 451 at 250 °C, which was about 10 times higher than that of sensor based on unloaded SnO2. Such enhanced gas sensing performances can be attributed to both the chemical and the electrical contribution of Pd loading. 相似文献
6.
N.S. RamgirAuthor Vitae M. GhoshAuthor VitaeP. VeerenderAuthor Vitae N. DattaAuthor VitaeM. KaurAuthor Vitae D.K. AswalAuthor VitaeS.K. GuptaAuthor Vitae 《Sensors and actuators. B, Chemical》2011,156(2):875-880
ZnO nanoparticles (NPs) of 5-15 nm size and nanowires (NWs) of 50-100 nm dia., exhibiting p and n-type characteristics, respectively, have been synthesized using simple chemical process. ZnO NW-films exhibited good sensitivity and selectivity towards H2S in ppm range with fast response and recovery times. Interestingly, ZnO NP-films showed p-type conductivity that has been obtained for the first time without intentional doping while NW-films showed n-type conduction as has also been reported in various earlier studies. The p- and n-type conductivities in NP- and NW-films have been confirmed using hot probe and Kelvin probe measurements. The n-type behavior of NW-films is attributed to oxygen vacancies, whereas the p-type nature of NP-films is attributed to the zinc vacancy, surface acceptor levels created by the adsorbed oxygen and/or the unintentional carbon doping in ZnO. 相似文献
7.
Vertically aligned ZnO nanorods and graphene hybrid architectures for high-sensitive flexible gas sensors 总被引:1,自引:0,他引:1
Jaeseok YiAuthor VitaeJung Min LeeAuthor Vitae Won Il ParkAuthor Vitae 《Sensors and actuators. B, Chemical》2011,155(1):264-269
We present the fabrication and characterization of new type of flexible gas sensors, composed mainly of a bottom ZnO conductive layer on metal foil, vertically aligned ZnO nanorod channel, and graphene-based top conductive electrode. Multiple cycling tests demonstrated the ZnO nanorods (NRs) and graphene (Gr) hybrid architectures accommodated the flexural deformation without mechanical or electrical failure for bending radius below 0.8 cm under the repeated bending and releasing up to 100 times. In addition, the hybrid architectures fabricated on glass substrate showed good optical transmittance larger than ∼70% for visible light, indicating potential application in transparent devices. Furthermore, our gas sensors demonstrated the ppm level detection of ethanol gas vapor with the sensitivity (resistance in air/resistance in target gas) as high as ∼9 for 10 ppm ethanol. 相似文献
8.
Gas sensing properties at room temperature of a quartz crystal microbalance coated with ZnO nanorods
Nguyen Van QuyAuthor VitaeVu Anh MinhAuthor Vitae Nguyen Van LuanAuthor VitaeVu Ngoc HungAuthor Vitae Nguyen Van HieuAuthor Vitae 《Sensors and actuators. B, Chemical》2011,153(1):188-193
Gas sensors based on a quartz crystal microbalance (QCM) coated with ZnO nanorods were developed for detection of NH3 at room temperature. Vertically well-aligned ZnO nanorods were synthesized by a novel wet chemical route at a low temperature of 90 °C, which was used to grow the ZnO nanorods directly on the QCM for the gas sensor application. The morphology of the ZnO nanorods was examined by field-emission scanning electron microscopy (FE-SEM). The diameter and length of the nanorods were 100 nm and 3 μm, respectively. The QCM coated with the ZnO nanorods gas sensor showed excellent performance to NH3 gas. The frequency shift (Δf) to 50 ppm NH3 at room temperature was about 9.1 Hz. It was found that the response and recovery times were varied with the ammonia concentration. The fabricated gas sensors showed good reproducibility and high stability. Moreover, the sensor showed a high selectivity to ammoniac gas over liquefied petroleum gas (LPG), nitrous oxide (N2O), carbon monoxide (CO), nitrogen dioxide (NO2), and carbon dioxide (CO2). 相似文献
9.
张嘉琪胡馨升胡发志等 《传感器与微系统》2014,(4):14-16,20
主要介绍了ZnO纳米棒修饰的石英晶体微天平(QCM)气体传感器的制备与测试。采用两步法在石英晶振片表面制备直径为100 nm的ZnO纳米棒敏感膜,构成QCM NH3传感器。检测系统为自主研发的基于LabVIEW平台的QCM气体传感器频率测试软件。检测NH3的体积分数为5×10-6~50×10-6,响应时间均在10 s以内,最大频差值为10.9 Hz,响应最大频差值与NH3体积分数呈现良好的线性关系。室温条件下,ZnO纳米棒敏感膜可以完全实现吸附解吸过程,具有可逆性。该传感器性能稳定,响应灵敏,具有重复性。 相似文献
10.
Xianghong LiuAuthor VitaeJun ZhangAuthor Vitae Taili YangAuthor VitaeXianzhi GuoAuthor Vitae Shihua WuAuthor Vitae Shurong WangAuthor Vitae 《Sensors and actuators. B, Chemical》2011,156(2):918-923
A novel sensor material of Pt nanoparticles (NPs) functionalized WO3 hybrid nanorods was fabricated via a one-pot method. The obtained Pt NPs decorated WO3 nanorods (Pt-WO3) were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). A comparative gas sensing study was carried out on both the Pt NPs decorated and undecorated WO3 nanorods in order to investigate the influence of Pt NPs on the gas sensing performances. Obtained results showed that the Pt-WO3 sensor exhibited fast response and recovery as well as high sensitivity compared with the undecorated sensor. The improved sensing properties were attributed to the spillover effect of Pt NPs and the electronic metal-support interaction. 相似文献
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12.
采用静电纺丝法制备了ZnO纳米纤维材料并使用氧等离子体对其进行表面处理.通过X射线衍射(XRD),扫描电子显微镜(SEM),BET比表面积测试以及X射线光电子能谱分析(XPS)等手段对样品的结构与形貌进行了表征分析.将氧等离子体处理前后的ZnO纳米纤维分别制成气体传感器,对浓度为1×10-6~100×10-6(体积分数)丙酮气体的敏感特性进行了测试分析.测试结果表明,氧等离子体处理后的ZnO纳米纤维响应值较未处理的ZnO纳米纤维有大幅度的提升,最佳工作温度也有所降低,且对甲醛、苯、甲苯、二甲苯等几种干扰气体表现出更好的选择性.从晶粒间势垒和耗尽层厚度等角度初步分析了氧等离子体处理改善ZnO气敏特性的机理. 相似文献
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14.
Huitao FanAuthor VitaeYi ZengAuthor Vitae Xiujuan XuAuthor VitaeNing LvAuthor Vitae Tong ZhangAuthor Vitae 《Sensors and actuators. B, Chemical》2011,153(1):170-175
Hollow ZnSnO3 microspheres were successfully prepared by hydrothermal method at 160 °C for 12 h. The prepared material was characterized by field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and X-ray diffraction measurements (XRD). The average diameter of the hollow ZnSnO3 microspheres was in the range of 400-600 nm. Compared with solid ZnSnO3 microspheres structure, the hollow ZnSnO3 microspheres showed better response (S) to butane. To 500 ppm butane, the sensor response (S) of the hollow ZnSnO3 microspheres was 5.79 at the optimum operating temperature of 380 °C, and the response and recovery time were 0.3 s and 0.65 s, respectively. The sensitivities of sensors based on this material were linear with the concentration of butane in the range of 100-1000 ppm. 相似文献
15.
Chien-Wei Liu Chen-Pin Hsu J. Andrew Yeh Yuh-Chang Sun Yu-Fen Huang Byung Hwan Chu Fan Ren Yu-Lin Wang 《Microsystem Technologies》2013,19(2):245-251
Water droplets were either pushed or pulled with an ultra-violet (UV) light on vertically aligned ZnO nanorods. Steric acid-immobilized ZnO nanorods grown on quartz substrates exhibit a hydrophobic surface possessing high contact angles between water droplets and the substrates. Exposure of UV onto droplets on ZnO NRs led to reduction of contact angles and resulted the internal circulating flows inside the droplets. Droplets located at different sites under the spot of the UV light created different magnitudes of contact angle changes and the internal circulating flows which allowed us to push the droplets away or pull the droplets toward the centre of the UV spot. 相似文献
16.
A.D. MasonAuthor VitaeC.-C. HuangAuthor Vitae S. KondoAuthor VitaeM.T. KoesdjojoAuthor Vitae Y.H. TennicoAuthor Vitae V.T. RemchoAuthor VitaeJ.F. Conley Jr.Author Vitae 《Sensors and actuators. B, Chemical》2011,155(1):245-252
Three methods of functionalizing ZnO NW surfaces with biotin were demonstrated. Biotinylated ZnO NWs were found to dissolve during exposure to deionized (DI) water, so a chemical vapor deposition (CVD) process was developed for parylene-A, a common moisture barrier with an amine group which allows further functionalization. Parylene-A coated ZnO NWs were found to be resistant to dissolution. Electrical measurements on parylene-A coated nanobridge devices showed normal operation with higher dark current and an attenuated response to UV and O2, indicating the ability to modulate environmental sensitivity. This work demonstrates the novel use of parylene-A coatings as an encapsulation layer as well as a potential starting platform for general functionalization of ZnO NW devices for selective sensing. 相似文献
17.
A. ForleoAuthor Vitae L. FranciosoAuthor VitaeS. CaponeAuthor Vitae F. CasinoAuthor VitaeP. SicilianoAuthor Vitae O.K. TanAuthor VitaeH. HuiAuthor Vitae 《Sensors and actuators. B, Chemical》2011,154(2):283-287
SnO2 nanorods were successfully deposited on 3″ Si/SiO2 wafers by inductively coupled plasma-enhanced chemical vapour deposition (PECVD) and a wafer-level patterning of nanorods layer for miniaturized solid state gas sensor fabrication were performed. Uniform needle-shaped SnO2 nanorods in situ grown were obtained under catalyst- and high temperature treatment-free growth condition. These nanorods have an average diameter between 5 and 15 nm and a length of 160-300 nm. The SnO2-nanorods based gas sensors were tested towards NH3 and CH3OH and gas sensing tests show remarkable response, showing promising and repeatable results compared with the SnO2 thin films gas sensors. 相似文献
18.
A method for low-temperature synthesis of a mixture of high-density ZnO nanoflakes and nanowires was developed to produce low-cost and high-efficiency gas sensors with ZnO nanostructures. ZnO nanoflakes and nanowires were grown on glass substrates by the RF sputter deposition of Zn particles and localized oxidation at a low temperature of 300 °C. The synthesized ZnO nanoflakes and nanowires were polycrystalline and had nanometer dimensions, as revealed by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) measuring. A gas sensor based on the mixture of ZnO nanoflakes/nanowires responded rapidly and sensitively to ethanol. The sensing properties of the ZnO nanostructure sensor were approximately 72% for 50 ppm ethanol gas at an operating temperature of 100 °C. The response to 10 ppm of ethanol gas was 42% at the same temperature. 相似文献
19.
Microsystem Technologies - High-density single-crystalline Ga-doped ZnO (GZO) nanorods were grown on glass substrate by hydrothermal method. The morphological and structural characteristics of the... 相似文献
20.
Bai ShouliAuthor VitaeChen LiangyuanAuthor Vitae Hu JingweiAuthor VitaeLi DianqingAuthor Vitae Luo RuixianAuthor VitaeChung Chiun LiuAuthor Vitae 《Sensors and actuators. B, Chemical》2011,159(1):97-102
Quantum size ZnO crystals have been synthesized successfully by a room temperature sol-gel process. Oleic acid (OA) has been used as capping agent to control the particle size of ZnO. The crystal structure and size of the ZnO are characterized by the X-ray diffraction (XRD) and transmission electron microscope (TEM). The XRD results show the as-synthesized ZnO has hexagonal wurtzite structure and the average crystallite size is 5.7 nm which is little less than TEM result. It is testified by photoluminescence (PL) and Raman spectra that the quantum size ZnO keeps the crystal structure of the bulk ZnO and possesses more surface defects. The quantum size ZnO has the highest response of 280 to NO2 and the highest selectivity of 31 and 49 corresponding to CO and CH4 at operating temperature of 290 °C. The effect of calcination temperatures on sensing property and transient response of the ZnO sensor are also investigated. 相似文献