摘要
利用纳米钯/β-环糊精复合物修饰镍钢电极(Pd/β-CD/TCh/Ni-Fe)制备了2,6-二氯苯酚(2,6-DCP)传感器。修饰电极的制备通过三个步骤:采用电化学方法将带正电的硫胆碱共价修饰到镍钢表面(TCh/Ni-Fe);将β-环糊精(β-CD)通过静电吸附自组装在TCh/Ni-Fe表面(β-CD/TCh/Ni-Fe);通过双电位阶跃法,将纳米钯沉积在β-CD/TCh/Ni-Fe表面。采用场发射扫描电镜、X-晶体衍射、X-射线光电子能谱及电化学技术表征了该修饰电极的特性。结果显示:纳米钯呈麦穗状,均匀地沉积在电极表面,粒径为17.2±4nm。Pd/β-CD/TCh/Ni-Fe电极对2,6-DCP的氧化还原有较强的电催化作用,在1×10-6～1×10-4 mol·L-1的浓度范围内,2,6-DCP的氧化峰电流与其浓度呈良好的线性增长关系[i(A)=2.8×10-3+11.9 Cx(mol·L-1),R=0.996,检测限:1×10-9 mol·L-1(3σ)]。
Abstract： Nanopalladium/β-cyclodextrin complex modified nickel steel electrode was prepared for 2,6-dichlorophenol sensor. The processes involved three steps; thiocholine was convently modified at the nickel steel electrode （Ni-Fe） using a cyclic voltammeter method （TCh/Ni-Fe） β-cyclodextrin （β-CD） was self-assembled at TCh/Ni-Fe by elec- trostatic attraction （β-CD/TCh/Ni-Fe） ; then, nano-palladium was electrodeposited at β-CD/TCh/Ni-Fe to form Pd/ β-CD/TCh/Ni-Fe. The electrode was characterized by various methods including field emission scanning electron mi- croscope, X ray diffraction, X-ray photoelectron spectroscopy and electrochemical techniques. A ear-like and equal distribution for nano- palladium could be observed with a size of 17.2±4 nm. The electrode showed an excellent electrocatalysis for the redox of 2,6-DCP. It has been successfully applied to 2,6-DCP sensor in a concentration range of 1×10-6 l×10 4 mol·L-I[i （A）=2.8X10-3q-11.9C×（mol·L 1）, R=0. 996, detection limit： 1×10 9 mol. L 1（3a）.
出处
《金属功能材料》
CAS
2012年第4期30-34,共5页
Metallic Functional Materials
基金
国家自然基金(21076054)
安徽省教育厅重点科研基金(2010AJZR-85
2011AJZR-87)
