叉指阵列薄膜微电极 (IDA)Thin-film interdigitated microelectrode array
薄膜技术能够室参比电极和辅助电极(AE) 集成为叉指阵列薄膜微电极。叉指阵列薄膜微电极(IDA)具有提高灵敏度和检测极限的优势。它的工作电极(WE)是由两个单独的可寻址的微电极阵列互相交叉组成的。
Electrochemical IDA sensor design | Electrochemical cell (2 mm ?) |
IDA 工作电极
不同的IDA微电极有铂和金两种选择。
部件编号 | 材料 | μElectrode width | μElectrode gap | Number of feet | Thickness |
ED-IDA1-Pt | Ti/Pt | 10 μm | 10 μm | 15 pairs | 50/150 nm |
ED-IDA5-Pt | Ti/Pt | 10 μm | 5 μm | 20 pairs | 50/150 nm |
ED-IDA6-Pt | Ti/Pt | 5 μm | 5 μm | 30 pairs | 50/150 nm |
ED-IDA1-Au | Ti/Au | 10 μm | 10 μm | 15 pairs | 50/150 nm |
ED-IDA5-Au | Ti/Au | 10 μm | 5 μm | 20 pairs | 50/150 nm |
ED-IDA6-Au | Ti/Au | 5 μm | 5 μm | 30 pairs | 50/150 nm |
叉指阵列薄膜微电极可用于单电极连接模式(only one WE, generator, is connected)或双电极连接模式(both WEs, generator and collector, are connected) 。双电极连接模式可以提升微电极的性能,在短时间内达到稳定状态,并提高分析信号强度。
叉指阵列薄膜微电极不同的设计(width and gap) 会影响氧化还原循环的数量以及收集效率。
Cyclic voltammograms for 1 mM K4Fe(CN)6 in 0.1 M KCl using single- and dual-mode at different Platinum IDA electrodes | Cyclic voltammograms for 1 mM ferrocene methylalcohol in 0.1 M H2SO4 using single- and dual-mode at different Gold IDA electrodes. |
Generator (WE1) potential cycled from-0.3 to 0.5 V at 50 mV/s. Collector (WE2) potential held constant at-0.3 V (dual-mode).
