摘要ZnO nanofibers are synthesized by an electrospinning method and characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). Two types of gas sensors are fabricated by loading these nanofibers as the sensing materials and their performances are investigated in detail. Compared with the sensors based on traditional ceramic tubes with Au electrodes (traditional sensors), the sensors fabricated by spinning ZnO nanofibers on ceramic planes with Ag-Pd electrodes (plane sensors) exhibit much higher sensing properties. The sensitivity for the plane sensors is about 30 to 100 ppm ethanol at 300 °C, while the value is only 13 for the traditional sensors. The response and recovery times are about 2 and 3 s for the plane sensors and are 3 and 6 s for the traditional sensors, respectively. Lower minimum-detection-limit is also found for the plane sensors. These improvements are explained by considering the morphological damage in the fabricating process for traditional sensors. The results suggest that the plane sensors are more suitable to sensing investigation for higher veracity.
Abstract：ZnO nanofibers are synthesized by an electrospinning method and characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). Two types of gas sensors are fabricated by loading these nanofibers as the sensing materials and their performances are investigated in detail. Compared with the sensors based on traditional ceramic tubes with Au electrodes (traditional sensors), the sensors fabricated by spinning ZnO nanofibers on ceramic planes with Ag-Pd electrodes (plane sensors) exhibit much higher sensing properties. The sensitivity for the plane sensors is about 30 to 100 ppm ethanol at 300 °C, while the value is only 13 for the traditional sensors. The response and recovery times are about 2 and 3 s for the plane sensors and are 3 and 6 s for the traditional sensors, respectively. Lower minimum-detection-limit is also found for the plane sensors. These improvements are explained by considering the morphological damage in the fabricating process for traditional sensors. The results suggest that the plane sensors are more suitable to sensing investigation for higher veracity.
XU Lei;WANG Rui**;LIU Yong;DONG Liang
. Influence of Fabricating Process on Gas Sensing Properties of ZnO Nanofiber-Based Sensors[J]. 中国物理快报, 2011, 28(4): 40701-040701.
XU Lei, WANG Rui**, LIU Yong, DONG Liang
. Influence of Fabricating Process on Gas Sensing Properties of ZnO Nanofiber-Based Sensors. Chin. Phys. Lett., 2011, 28(4): 40701-040701.
[1] Janata J et al 1994 Anal. Chem. 66 207
[2] Huang X J et al 2007 Sensors Actuators B 122 659
[3] Qiu W et al 2009 Chin. Phys. Lett. 26 080701
[4] Li L J et al 2010 Chin. Phys. Lett. 27 086105
[5] Zhong Z et al 2010 Chin. Phys. Lett. 27 096101
[6] Zhu J et al 2009 Chin. Phys. Lett. 26 014204
[7] Liu L et al 2009 Chin. Phys. Lett. 26 090701
[8] Lee S M et al 2003 Microelectronics J. 34 115
[9] Neri G et al 2008 Sensors Actuators B 132 224
[10] Franke M E et al 2006 Small 2 36
[11] Liu Y, Koep E and Liu M 2005 Chem. Mater. 17 3997
[12] Wan Q et al 2004 Appl. Phys. Lett. 84 3654
[13] Qi Q et al 2008 Sensors Actuators B 134 166
[14] Xu J et al 2007 Sensors Actuators B 120 694
[15] Ge J P et al 2006 Sensors Actuators B 113 937
[16] Liang Y X et al 2004 Appl. Phys. Lett. 85 666
[17] Huang J and Wan Q 2009 Sensors 9 9903
[18] Qiu Y and Yang S 2007 Adv. Funct. Mater. 17 1345
[19] Greiner A et al 2007 Angew. Chem. Int. Ed. 46 5670
[20] Liu L et al 2010 Sensors Actuators B 150 806
[21] Zhang H, Li Z et al 2010 Sensors Actuators B 147 111
[22] Zhang T, Qi Q, Liu K X, Liu L, Zhang L and Xu B K 2006 Trans. Nanoferrous Met. Soc. Chin. 16 780
[23] Grasset F et al 2008 Adv. Mater. 20 1710
[24] Yamazoe N et al 1979 Surf. Sci. 86 335
[25] Barsan N et al 2007 Sensors Actuators B 121 18
[26] Wu W et al 2010 Nanoscale Res. Lett. 5 1471
[27] Li D and Xia Y 2004 Adv. Mater. 16 1151
[28] Kolmakov A and Moskovits M 2004 Annu. Rev. Mater. Res. 34 151
[29] Sahm T et al 2004 Sensors Actuators B 98 148
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