排序方式: 共有4条查询结果,搜索用时 0 毫秒
1
1.
碳纤维上电沉积Pd-Ag合金纳米粒子链及其氢传感性能 总被引:1,自引:0,他引:1
在碳纤维上采用三脉冲电沉积的方法制备出钯银合金纳米粒子链.把表面覆盖有Pd-Ag合金纳米粒子链的碳纤维组装成氢气传感器.采用扫描电子显微镜(SEM)和X射线能谱(EDX)表征了合金纳米粒子链的形貌和成分,应用CHI660B电化学工作站测试其氢传感性能.结果表明,在钯、银离子摩尔比为15∶1的电解液中,在-1.0--1.5 V下,成核5-40 ms;在-0.25--0.35 V,生长200-300 s的条件下,即可获得银的质量分数为16.0%-25.0%的钯银合金纳米粒子链阵列.在室温下,传感器对在0.30%-5.00%(φ,体积分数,下同)范围内的氢气有响应,最快响应时间约为300 s,灵敏度最高可达31.0%;氢在0.30%-1.20%的范围内响应电流与氢气浓度成线性关系,超过4.00%时响应电流不再随浓度的增加而变化;在低于3.50%的浓度下氢传感器的重现性良好. 相似文献
2.
The magnetic and dielectric properties of multiferroic Sr- substituted Zn2-Y hexagonal ferrites
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The magnetic and dielectric properties of Sr-substituted Zn2-Y hexagonal ferrites (Ba2-x SrxZn2Fe12O22, 1.0 〈 x ≤ 1.5) are studied in this paper. Sr substitution will lead to the variation of cation occupation, which influences both the magnetic and electric properties. As Sr content x rises from 1.0 to 1.5, magnetic hysteresis loop gets wider gradually and the permeability drops rapidly due to the transformation from ferrimagnetic to antiferromagnetic phase. Moreover, permittivity rises with increasing Sr content. Under a certain external magnetic field, the phase transition of helical spin structure of Ba0.5Srl.5Zn2Fe12O22 at about 295 K seems to open a possibility for the room-temperature ferroelectricity induced by magnetic field. But its low resistivity prevents the observation of ferroelectric and magnetoelectric properties at room-temperature. 相似文献
3.
Current-voltage characteristics of lead zirconate titanate/nickel bilayered hollow cylindrical magnetoelectric composites
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Current--voltage measurements obtained from lead zirconate
titanate/nickel bilayered hollow cylindrical magnetoelectric
composite showed that a sinusoidal current applied to the copper
coil wrapped around the hollow cylinder circumference induces
voltage across the lead zirconate titanate layer thickness. The
current--voltage coefficient and the maximum induced voltage in lead
zirconate titanate at 1~kHz and resonance (60.1~kHz) frequencies
increased linearly with the number of the coil turns and the applied
current. The resonance frequency corresponds to the
electromechanical resonance frequency. The current--voltage
coefficient can be significantly improved by optimizing the
magnetoelectric structure geometry and/or increasing the number of
coil turns. Hollow cylindrical lead zirconate titanate/nickel
structures can be potentially used as current sensors. 相似文献
4.
1