共查询到17条相似文献,搜索用时 93 毫秒
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将碳纳米管(CNT)分散在壳聚糖(CHIT)溶液中固定到玻碳电极表面,用戊二醛交联甲苯胺蓝(TB)得到复合膜(TB-CNT-CHIT)修饰电极.由于碳纳米管具有良好的电子传递性能,与碱性生物染料甲苯胺蓝之间表现出协同作用,使甲苯胺蓝的电化学活性得到了较大的提高.此TB-CNT-CHIT复合膜修饰的玻碳电极在较低电位下对过氧化氢具有良好的电催化性能,与TB-CHIT膜比较,测定H2O2的灵敏度增大了近20倍.将复合组份多层修饰到电极上,通过戊二醛固定葡萄糖氧化酶,制备了一种新的葡萄生物传感器,该传感器在-0.2 V下对葡萄糖响应的线性范围为0.05~10 mM,检测下限为10μM.传感器的灵敏度较高,响应快,性能稳定. 相似文献
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将分散在Nafion溶液中的多壁碳纳米管(MWNT)修饰玻碳电极(GCE),再在该膜上电沉积一层铂纳米粒子,制成铂纳米颗粒修饰的碳纳米管Nafion膜电极(Nafion-MWNT-Pt/GCE),并吸附固定葡萄糖氧化酶(GOD),构建电流型葡萄糖生物传感器。考察了Nafion-MWNT-Pt/GCE的电化学特性,发现沉积铂纳米粒子后,Fe(CN)6-3/-4电对在Nafion-MWNT-Pt/GCE上的氧化峰和还原蜂之间的电势差(ΔE)为179mV,小于未修饰铂纳米粒子的碳纳米管Nafion膜电极的ΔE(190mV),表明碳纳米管上电沉积的铂纳米粒子可加速电极的电子传递,电化学反应具有良好的可逆性。此外,铂纳米粒子尚具有良好的催化H2O2氧化的特性,H2O2在Nafion-MWNT-Pt/GCE上的计时电流响应明显增大。基于Nafion-MWNT-Pt/GCE的葡萄糖生物传感器显示了良好的传感性能,其检测线性范围为2.1×10-5~7.6×10-3mol/L,检测下限为1.0×10-6mol/L。 相似文献
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新型碳纳米管气敏传感器的研究进展 总被引:1,自引:0,他引:1
该文综述了新型的单壁碳纳米管SWNT、多壁碳纳米管MWNT、多壁碳纳米管阵列气敏传感器的制备、结构特点、气敏性能和未来的发展方向。 相似文献
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以多壁纳米碳管(MWCNTs)为电子媒介体和酶的吸附载体,利用层层累积的自组装技术固定葡萄糖氧化酶(GOx)的多层(MWCNTs/GOx)n复合薄膜修饰电极,制备了一种新型葡萄糖生物传感器。结果表明:传感器对葡萄糖的响应电流值随着MWCNTs/GOx复合薄膜层数的不同而变化,当MWCNTs/GOx复合薄膜的层数为6时,响应电流值达到最大。(MWCNTs/GOx)6复合薄膜修饰的葡萄糖生物传感器对3×10-2mol/L葡萄糖的响应电流为1.63μA,响应时间仅为6.7 s。该生物传感器检测的线性范围为5×10-4~1.5×10-2mol/L,最低检测浓度可达0.9×10-4mol/L。 相似文献
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基于碳纳米管修饰丝网印刷碳糊电极的葡萄糖和尿酸生物传感器 总被引:8,自引:2,他引:8
在丝网印刷碳糊电极上利用吸附法固定葡萄糖氧化酶或尿酸酶,并用碳纳米管进行修饰,铁氰化钾作为电子传递剂,制作用于测量人体血浆中葡萄糖和尿酸浓度的生物传感器.葡萄糖传感器的响应时间仅为5 s,响应电流范围为1.2~30μA,线性测量范围为1~33.3 mM,尿酸传感器响应时间为和电流范围分别为50 s,0.7~14μA,线形测量范围是2~20 mg/dL.用碳纳米管修饰酶电极,改善了电极表面条件,加快了电极反应速度,并提高了传感器的灵敏度.通过碳纳米管修饰电极,葡萄糖传感器的灵敏度从0.333 8μA/mM提高到0.843 2μA/mM,尿酸传感器的灵敏度从0.402 8μA/(mg/dL)提高到0.713 8μA/(mg/dL). 相似文献
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研制了一种基于单根空心微针的新型植入式葡萄糖传感器,用于对人体血糖变化趋势进行连续监测.单根空心微针由结构相同的两个沿轴向磨去半边的不锈钢针管通过绝缘胶粘结而成,其分别作为传感器的工作电极与辅助电极;参比电极是置于该微针通孔之中的Ag/AgCl细丝;葡萄糖氧化酶( GOD)置于针尖的通孔处.测试结果表明:传感器的线性范围为3~22 mmol/L,灵敏度为1. 11μA/mmol/L,响应时间为10 s,且具有较好的抗干扰性. 相似文献
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Junxiang GuoAuthor VitaeYaqin ChaiAuthor Vitae Ruo YuanAuthor VitaeZhongju SongAuthor Vitae Zhifen ZouAuthor Vitae 《Sensors and actuators. B, Chemical》2011,155(2):639-645
For the first time a novel derivatized multi-walled carbon nanotubes-based Pb2+ carbon paste electrode is reported. The electrode with optimum composition, exhibits an excellent Nernstian response to Pb2+ ion ranging from 5.9 × 10−10 to 1.0 × 10−2 M with a detection limit of 3.2 × 10−10 M and a slope of 29.5 ± 0.3 mV dec−1 over a wide pH range (2.5-6.5) with a fast response time (25 s) at 25 °C. Moreover, it also shows a high selectivity and a long life time (more than 3 months). Importantly, the response mechanism of the proposed electrode was investigated using AC impedance technique. Finally, the electrode was successfully applied for the determination of Pb2+ ion concentration in environmental samples, e.g. soils, waste waters, lead accumulator waste and black tea, and for potentiometric titration of sulfate anion. 相似文献
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Bruno C. JanegitzAuthor VitaeRasa PauliukaiteAuthor Vitae Mariana E. GhicaAuthor VitaeChristopher M.A. BrettAuthor Vitae Orlando Fatibello-FilhoAuthor Vitae 《Sensors and actuators. B, Chemical》2011,158(1):411-417
A glassy carbon electrode modified with functionalized multiwalled carbon nanotubes (CNTs) immobilized by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide/N-hydroxysuccinimide (EDC/NHS) in a dihexadecylphosphate film was prepared and characterized by cyclic voltammetry and scanning electron microscopy. It was used as a support for FAD or glucose oxidase (GOx) immobilization with EDC/NHS crosslinking agents. Cyclic voltammetry of GOx immobilized onto the surface of CNTs showed a pair of well-defined redox peaks, which correspond to the direct electron transfer of GOx, with a formal potential of −0.418 V vs. Ag/AgCl (3 M KCl) in 0.1 M phosphate buffer solution (pH 7.0). An apparent heterogeneous electron transfer rate constant of 1.69 s−1 was obtained. The dependence of half wave potential on pH indicated that the direct electron transfer reaction of GOx involves a two-electron, two-proton transfer. The determination of glucose was carried out by square wave voltammetry and the developed biosensor showed good reproducibility and stability. The proposed method could be easily extended to immobilize and evaluate the direct electron transfer of other redox enzymes or proteins. 相似文献
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用交联剂戊二醛把葡萄糖氧化酶(GOx)固定在多聚赖氨酸(polylysine)修饰的碳纳米管(CNT)上,然后将Nafion和修饰上葡萄糖氧化酶的碳纳米管(CNT-lysine-GOx)混合均匀涂在Pt纳米颗粒修饰的金电极表面制备成葡萄糖传感器。探讨了Pt沉积时间、Nafion中碳纳米管的含量、缓冲液的pH值以及工作电位对电极响应的影响。实验结果表明该传感器具有响应快、稳定性好等优点,催化电流与葡萄糖的浓度在0.1μmol/L~6mmol/L范围内成线性关系,响应时间小于5s。 相似文献
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在玻碳电极表面形成碳纳米管/壳聚糖膜/空壳纳米钯均匀致密稳定的修饰层,制备了用于测定葡萄糖的新型无酶传感器。该传感器可以快速地实现电极与葡萄糖之间的直接电子转移,有良好的稳定性。在最佳实验条件下,用差分脉冲伏安法(DPV)测定葡萄糖,其响应电流与葡萄糖的浓度在2.5×10-7~1.5×10-6mol/L范围内有很好的线性关系,线性回归方程为I(μA)=2.169c(μmol/L)+8.399×10-6,相关系数r=0.9872。 相似文献