Preparation and performance of CNTs-Pt formaldehyde sensor and CNTs-Au glucose sensor

Abstract

Purpose Since carbon nanotubes (CNTs) were discovered by Iijima in 1991, they have gained more and more attention by people because of their unique physical and chemical properties. The CNTs have one-dimensional nanostructure, high surface adsorption capacity, good conductivity and electronic ballistic transmission characteristics and therefore have excellent mechanical, electrical, physical and chemical properties. CNTs are ideal basic materials to make nanometer gas sensors. Nanometallic materials function as to enhance electrode activity and promote the electron transfer, so if composite nanometallic materials M (such as Au, Pt, Cu and Pd) and CNTs are used, all kinds of their characters of components would have coeffect. Electrochemical sensors by use of such composite as electrode would have a higher detection sensitivity. Design/methodology/approach CNTs were synthesized via chemical vapor deposition technique and were purified afterward. CNTs-M(Pt,Au) suspension was prepared by chemical deposition using spinning disc processor (SDP) and was coated on gold electrode. The modified electrodes were constructed, based on immobilization of glucose oxidase on an Au electrode by electrostatic effect. CNTs-Pt/ glassy carbon electrodes (GCE) electrodes were made by electrochemically deposition of platinum particles on GCE modified by CNTs. The microstructures of the harvested CNTs, CNTs-M (M = Au, Pt) were analyzed under scanning electron microscopy and transmission electron microscopy. The application of the sensor in medical detection has been evaluated. Findings The results shown that CNTs-Au biosensors exhibit good reproducibility, stability and fast response to glucose detection, it can be used in the clinic detection of glucose concentration in human serum. Using CNTs-Pt/GCE for formaldehyde detection exhibited high sensitivity and good reproducibility. Originality/value This study modified CNTs by using self-assembled techniques through SDP with nano Pt and Au by electrodeposition for the first time. CNTs-Pt/GCE electrode was prepared by depositing platinum particles electrochemically on GCE modified by CNTs. CNTs-Au-modified electrode was prepared by immobilization of glucose oxidase on an Au electrode first by electrostatic effect. Electrochemical behaviors of glucose at CNTs-Au and formaldehyde at CNTs-Pt/GCE were investigated by cyclic voltammetry.

Recent Advances in Materials for Enzyme-free Electrochemical Glucose Sensors

“…Since CNTs were discovered by Iijima in 1991, they have received attention continuously because of their unique physical and chemical properties. (100) Ye et al were pioneers in applying CNTs in enzyme-free glucose sensors and found that CNTs improved the sensitivity of the electrodes to glucose detection. (101) Baghayeri et al prepared Ag NPs on metformin-functionalized MWCNTs using an electrochemical method.…”

Portable glucose sensing analysis based on laser-induced graphene composite electrode

“…8,9 Composites that incorporate graphene, conductive polymers, and metal nanoparticles offer improved performance and expand the range of applications for these materials. Graphene/conductive polymer/metal nanoparticle composites can detect a variety of compounds and molecules such as glucose, urea, protein, and DNA, [10][11][12][13][14] indicating promising prospects in the eld of biosensing.…”

Facile Mesoporous Hollow Silica Synthesis for Formaldehyde Adsorption

“…Various studies are being carried out using nanomaterial supports to adsorb formaldehyde. Carbon nanomaterials such as carbon nanotubes [ 10 , 11 , 12 ] and graphene [ 13 , 14 , 15 ] have been recently employed in various attempts to adsorb formaldehyde. Zeolite [ 16 , 17 , 18 ], active carbon [ 19 , 20 ], and porous silica nanomaterials [ 21 , 22 , 23 ] are also utilized as support materials for adsorption.…”