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RSC Advances · 2019 ·Vol. 9 ·期 46 ·26712-26717 · IF 3.049

Photoelectrochemical detection of ultra-trace fluorine ion using TiO2 nanorod arrays as a probe

Yongzhao Su,Duotian Chen,Siyuan Yang,Shengsen Zhang,Yingju Liu,Yueping Fang,Qiao Zhang,Feng Peng

A photoelectrochemical (PEC) method based on the etching reaction of F ions on the surface of TiO2 nanorod arrays (TNRs) was proposed for the high sensitivity and selectivity detection of F ions. With the increase of F ion concentration, the surface etching reaction on TNR becomes more intense, resulting in the increased number of surface active sites, the reduction of electron transfer resistance, and the increase of photocurrent density. The prepared TNRs as a PEC probe exhibits a good linear relationship between photocurrent increment and the logarithm of F ion concentration in the range from 0.05 to 1000 nM with an ultra-trace detection limit of 0.03 nM for F ion detection.

研究领域: 分析化学 · 环境监测 · 纳米材料 · 电化学传感 · 生物医学工程

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JOURNAL OF ELECTROANALYTICAL CHEMISTRY · 2015 · IF 2.729

Electrochemical sensor for facile detection of trace luteolin based on thio-β-cyclodextrin functionalized graphene/gold nanoparticles hybrids

Tingxuan Wu,Zhiguang Liu,Yujing Guo,Chuan Dong

In this work, a simple and highly sensitive electrochemical method was developed to detect luteolin based on thio-β-cyclodextrin functionalized graphene/gold nanoparticles modified glassy carbon electrode (SH-β-CD-GNs/AuNPs/GCE). The peak currents of luteolin on the SH-β-CD-GNs/AuNPs/GCE can be greatly enhanced compared to the SH-β-CD-GNs/GCE and the bare GCE. It suggests that the nanocomposite not only shows the excellent electrical properties of GNs and AuNPs but also exhibits higher enrichment ability of cyclodextrins via the host-guest interaction between cyclodextrin and luteolin . At the SH-β-CD-GNs/AuNPs/GCE, the peak currents increased linearly with the concentration of luteolin in the range of 10.0 pM to 10.0 μM. The detection limit was estimated to be 3.3 pM (S/N = 3), which was more sensitive or comparable with the previous electrochemical sensors for luteolin detection. The analytical performance of this sensor has been evaluated for the detection of luteolin in human serum with satisfactory results. Furthermore, the method might open up a new possibility by using the nanohybrids to monitor other flavonoids which can form host–guest complexes with cyclodextrins.

研究领域: 分析化学 · 纳米生物技术 · 电分析化学 · 药物代谢 · 生物传感器

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Photoelectrochemical detection of ultra-trace fluorine ion using TiO2 nanorod arrays as a probe

Electrochemical sensor for facile detection of trace luteolin based on thio-β-cyclodextrin functionalized graphene/gold nanoparticles hybrids