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ABSTRACT: We demonstrated a flexible strain sensor based on ZnSnO(3) nanowires/microwires for the first time. High-resolution transmission electron microscopy indicates that the ZnSnO(3) belongs to a rhombohedral structure with an R3c space group and is grown along the [001] axis. On the basis of our experimental observation and theoretical calculation, the characteristic I-V curves of ZnSnO(3) revealed that our strain sensors had ultrahigh sensitivity, which is attributed to the piezopotential-modulated change in Schottky barrier height (SBH), that is, the piezotronic effect. The on/off ratio of our device is ∼587, and a gauge factor of 3740 has been demonstrated, which is 19 times higher than that of Si and three times higher than those of carbon nanotubes and ZnO nanowires.
ACS Nano 04/2012; 6(5):4369-74. · 10.77 Impact Factor
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ABSTRACT: We studied the dependence of the output of the piezoelectric nanogenerator (NG) on the inclining orientation of the ZnO nanowire arrays (NWAs). The oblique-aligned NWAs were grown by combing a modified oblique-angle sputtering technique for preparing the seed layer and hydrothermal growth. The piezoelectric output of the NWAs was studied by scanning the tip of an atomic force microscope along four different directions in reference to the inclining direction of the NWs. The statistical outputs were analyzed in reference to the theoretically calculated piezopotential distribution in the NWs. Our study provides in-depth understanding about the performance of NGs.
ACS Nano 08/2011; 5(8):6707-13. · 10.77 Impact Factor
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ABSTRACT: A content and thematic analysis of 109 episodes (94.9 h) of prime-time dramas examined the portrayals of aging and the nature of intergenerational interaction involving older adults on Taiwanese television. The content analysis revealed that older characters, regardless of sex, appeared less frequently and in less prominent roles than other adult characters, but not in comparison to adolescents and children. The older characters who did appear, however, were predominantly portrayed as cognitively sound and physically healthy. The thematic analysis provided a different picture, showing that older characters talked about age explicitly, strategically linking it to death and despondence, to influence younger characters. Communication behavior themes identified included supporting, superiority, and controlling for older characters, and reverence/respect for younger characters. Findings are compared to those from similar studies of U.S. media and discussed from a Cultivation Theory perspective in terms of their reinforcement of Chinese age stereotypes and the traditional values of filial piety and age hierarchy in the context of globalization and culture change.
Journal of Cross-Cultural Gerontology 09/2009; 24(4):355-72.
