• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Effect of the aromatic precursor flow rate on the morphology and properties of carbon nanostructures in plasma enhanced chemical vapor deposition
【24h】

Effect of the aromatic precursor flow rate on the morphology and properties of carbon nanostructures in plasma enhanced chemical vapor deposition

机译：芳族前体流速对血浆增强化学气相沉积中碳纳米结构形态和性质的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Understanding the effects of the synthesis parameters on the morphology and electrochemical properties of nanocarbon layers is a key step in the development of application-tailored nanostructures. In this paper we used an aromatic carbon as a new kind of precursor for the synthesis of carbon based nanostructures by plasma enhanced chemical vapor deposition (PECVD). Complex precursor molecules enable a new degree of influence over the atomic structure of PECVD synthesized carbons. Here, we report on the synthesis and characterization of the nanostructures resulting from varied flow rates of p -xylene used as carbon precursor. By changing the flow rate of the precursor, three different morphologies with graphitic character were synthesized. The resulting structures were carbon nanofibers (CNF), freestanding carbon nanowalls (fCNW) and interconnected carbon nanowalls (iCNW), formed at flow rates of 3 ml h ~(?1) , between 1 and 3 ml h ~(?1) and less than 1 ml h ~(?1) , respectively. Structural characterization by transmission electron microscopy and Raman spectroscopy indicate a lower defect density for the CNF in comparison to the CNW nanostructures. The electrochemical characterization of the oxygen reduction reaction onset potential and effective surface area feature a significantly higher onset at around ?171 mV and an electrochemically active surface area of 0.76 μm ~(?1) for the iCNW compared to ?196 mV, 0.61 μm ~(?1) and 0.22 μm ~(?1) for the fCNW and CNF, respectively. The similarities in defect density and differences in activity observed for the iCNW and fCNF suggest that the kind of the defects determines the electrochemical properties. Thus, the iCNW was identified as the most appropriate morphology for further investigations.
机译：了解合成参数对纳米碳层的形态和电化学性质的影响是施用型纳米结构的发展的关键步骤。在本文中，我们使用芳族碳作为新种类的前体，用于通过等离子体增强化学气相沉积（PECVD）合成碳基纳米结构。复杂的前体分子使得在PECVD合成碳的原子结构上实现了新的影响。在此，我们报道由用作碳前体的不同流速的纳米结构的合成和表征报告。通过改变前体的流速，合成了具有石墨特征的三种不同形态。所得结构是碳纳米纤维（CNF），独立式碳纳米瓦尔（FCNW）和互连的碳纳米瓦尔（ICNW），形成为3ml H〜（α1）的流速，在1-3ml H〜（α1）和分别小于1mL〜（？1）。通过透射电子显微镜和拉曼光谱的结构表征表明与CNW纳米结构相比，CNF的缺陷密度较低。氧还原反应发作潜在和有效表面积的电化学表征特征在α171mV周围的明显较高，电化学活性表面积为0.76μm〜（Δ1），而ICNW与α196mV相比，0.61μm〜 FCNW和CNF的0.22μm〜（Δ1）分别为0.22μm〜（Δ1）。 ICNW和FCNF观察到的缺陷密度和活动差异的相似性表明，这种缺陷的种类决定了电化学性质。因此，ICNW被确定为进一步调查的最合适的形态。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号