Morphology optimization of highly oriented carbon nanotubes for bioengineering applications

The remarkable properties of high oriented vertically aligned carbon nanotubes make them attractive for bioengineering applications. In this paper, we describe a process of growing long oriented CNTs arrays to improve the electrical properties of subsequent devices based on CNTs. Chemical vapour deposition (CVD) was used to deposit highly oriented CNTs with camphor oil as its carbon source, and argon as its carrier gas to grow perpendicular CNTs on the surface of a silicon substrate in the presence of ferrocene as a metallic catalyst. Images taken by the field emission electron microscopy (FESEM) indicate that the formation mechanism of oriented CNTs, with high morphological purity of nanotubes, depends significantly on the deposition time and applied temperature to the furnaces. This method might be an effective method to produce highly oriented multiwall carbon nanotubes at different aspect ratios

Effects of synthetic explanatory variable on saturation magnetization of colloidal nanomagnetite slurry

In this contribution, stable nanomagnetite slurry have been successfully prepared by coprecipitation method. The synthesis parameters, such as reaction temperature, heating time, surfactant concentration and precipitating agent addition rate affected magnetic properties of synthetic nanomagnetite slurries were also investigated. We discovered the optimum reaction parameters based on the highest saturation magnetization obtained under our experimental condition to disperse magnetite nanoparticles in the aqueous medium using dodecanoic acid as a surfactant. The highest saturation magnetization was achieved when 0.5:1 mole ratio of dodecanoic acid to magnetite was used and NH4OH with an addition rate of 5 ml min(-1) was added to the solution while time and temperature for heating were 45 min at 80 degrees C. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved

Carbon-based nanobiohybrid thin film for amperometric glucose sensing

This pioneering study involved the fabrication of a new class of nanohybrid-based electrochemical glucose biosensor. First, three-dimensional (3D) graphene was fabricated as a platform of multiwalled carbon nanotube (MWCNT). Then, it was used to immobilize glucose oxidase (GOD) on nanohybrid thin film via the entrapment technique. The modified glucose biosensor indicated excellent biocatalytic activity toward the glucose measurment with a sensitivity of up to 49.58 μA mM–1 cm–2 and a wide linear dynamic range up to 16 mM. The fabricated biosensor shows an excellent stability of 87.8%, with its current diminishing after 3 months. This facile and simple electrochemical method for glucose monitoring using a modified glassy carbon electrode (GCE) by 3DG-MWCNT-GOD could open new avenues in producing of a inexpensive and sensitive glucose nanobiosensors.Samira Bagheri, Amin Termehyousefi, Negar Mansouri, Arman Amani Babadi, Mohd Sayuti Abd Karim, and Nahrizul Adib Kadr

Polymers in biosensors

Polymers can be conductive or nonconductive, natural or synthetic, and have been widely used in the development of biosensors; polymers can be processed at a large scale at a relatively low cost. Poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), PANI, and PPy are widely used in fabricating biosensors owing to their intrinsic conductive property. Although conductivity is crucial in developing biosensors, a large number of nonconductive polymers such as chitin, chitosan, gelatin, dextran, cellulose, and polystyrene also attract interest for their function as support matrices for the immobilization of biomolecules. The non- conductive polymers can be classified into two categories: natural and synthetic. This chapter focuses on the potential use of polymer composites in biosensors