反应气源中硼碳比对BDD电极电化学检测Cr^(6+)的影响  

Effect of Boron-carbon Ratio on the Electrochemical Detection of Cr^(6+) with Boron Doped Diamond Electrodes

作　　者：刘学维 王兵[1] 熊鹰[1] 冯真[1] 廖健淞 韩汶洪 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,绵阳621010

出　　处：《武汉理工大学学报》2014年第4期24-29,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金委员会与中国工程物理研究院联合基金(U1330127);国家自然科学基金青年基金(11205127);碳纳米材料四川省青年科技创新研究团队专项(2011JTD0017)

摘　　要：采用微波等离子体化学气相沉积法(MPCVD)以氢气和甲烷为生长源、硼烷作掺杂源,在不同硼碳比(B/C)下制备不同硼含量的掺硼金刚石(BDD)薄膜电极,通过扫描电镜、拉曼光谱对其表面形貌、组成及结晶质量进行对比分析。依次将不同B/C下制备的BDD电极作为工作电极,通过差分脉冲伏安法检测溶液中痕量Cr6+浓度。结果表明,随着B/C增大,BDD电极膜材中金刚石晶粒间密实度下降,晶粒完整度变差;电极电化学检测Cr6+信号随反应气源中B/C增大而增大,当B/C=0.006时信号最强,电极检测限可达12ppb。加入干扰离子后检测效果依然良好。但B/C继续增大检测信号会随之降低。B/C在0.004~0.01范围内制备的BDD电极具有相对较好的电化学检测Cr6+性能。By using microwave plasma chemical vapor deposition technology, BDD film electrodes were prepared under different B/C ratios with hydrogen using methane as grouing source and boranas as doping source. The surface texture, composition and crystal quality of obtained films were characterized by scanning electron microscopy （SEM） and Raman spectra. To explore their electrochemistry performance in Cr6＋ concentration detection, the BDD electrodes were used as working electrodes in Cr6＋ solution with differential pulse voltammetry. The experimental results show that with the in crease of B/C, the compactness and integrity of diamond grains in the films decrease. Moreover, the electrochemistry signal of Cr6＋ increases in initial stage, and the strongest one appears when B/C=0. 006 along with the detection limit of electrode reach 12 ppb. The detection effect remains good after interference ions are added. However, with the B/C fur ther increasing, the detection signal on the contrary decreases. The BBD electrode made with B/C within 0. 004-0. 01 has a superior Cr6＋ electrochemical detection performance.

关 键 词：BDD电极 B C 差分脉冲伏安法 Cr6+检测 

分 类 号：TB43[一般工业技术] O646[理学—物理化学]