Inkjet printed and “doctor blade” TiO2 photodetectors for DNA biosensors

Bernacka-Wojcik, Iwona; Senadeera, G.K.R.; Wójcik, P.; Silva, Leonardo Bione; Dória, Gonçalo; Baptista, Pedro V.; Águas, Hugo; Fortunato, Elvira; Martins, Rodrigo

doi:10.1016/j.bios.2009.09.027

Cited by 62 publications

(44 citation statements)

References 18 publications

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“…Titanium dioxide (TiO 2 ) has been extensively studied for applications ranging from sensors [1,2] to dye-solar cells [3]. However, recently, this material has been widely used as photocatalyst agents [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications

et al. 2017

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Abstract:In the present study, titanium dioxide nanostructures were synthesized through microwave irradiation. In a typical microwave synthesis, nanorod spheres in the powder form were simultaneously produced with nanorod arrays grown on polyethylene terephthalate (PET) substrates. The syntheses were performed in water or ethanol with limited temperature at 80 • C and 200 • C. A simple and low-cost approach was used for the arrays growth, which involved a PET substrate with a zinc oxide seed layer deposited by spin-coating. X-ray diffraction (XRD) and Raman spectroscopy revealed that synthesis in water result in a mixture of brookite and rutile phases, while using ethanol as solvent it was only observed the rutile phase. Scanning electron microscopy (SEM) showed that the synthesized spheres were in the micrometer range appearing as aggregates of fine nanorods. The arrays maintained the sphere nanorod aggregate structures and the synthesis totally covered the flexible substrates. Transmission electron microscopy (TEM) was used to identify the brookite structure. The optical band gaps of all materials have been determined from diffuse reflectance spectroscopy. Photocatalytic activity was assessed from rhodamine B degradation with remarkable degradability performance under ultraviolet (UV) radiation. Reusability experiments were carried out for the best photocatalyst, which also revealed notable photocatalytic activity under solar radiation. The present study is an interesting and competitive alternative for the photocatalysts existing nowadays, as it simultaneously results in highly photoactive powders and flexible materials produced with low-cost synthesis routes such as microwave irradiation.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications

et al. 2017

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“…However, obtaining a uniform nanocrystalline film with good adhesion to the substrate and desired functionality still remains a challenge. As it was previously reported by our group [27,28], the advent of printing deposition techniques has led to new possibilities in a field of thin solid films based on MO X NPs. Printing techniques, apart from being widely use in graphics, are promising and attractive fabrication methods for a cost-efficient "low-end" electronics.…”

Section: Introductionmentioning

confidence: 86%

“…An innovative and dynamic research in this area results in new materials and devices, demonstrating their potential to cope with ever-changing requirements and challenges of the electronic market. It was demonstrated that the application of ink-jet printing for deposition of MO X dispersion provides an excellent method for the production of inorganic thin films with controlled composition and microstructure for electrochemical devices such as dye-synthesized solar cells (DSCs) [27] and electrochromic (EC) windows/displays [28,29]. The use of printing techniques is particularly promising for electrochemically active film development, because of its merits of low 3 Hydrothermal growth using crystal seeds [26] TiO 2 Ink-jet printing Dye-sensitized solar cells [27] a-WO 3 /TiO 2 /WO Xprocessing energy, precise patterning with reduced raw material waste, high throughput, and flexibility in deposited film composition.…”

Section: Introductionmentioning

confidence: 99%

Metal Oxide Nanoparticle Engineering for Printed Electrochemical Applications

Wójcik

Pereira

Martins

et al. 2015

Handbook of Nanoelectrochemistry

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Engineering procedures governing the selection or development of printable nanostructured metal oxide nanoparticles for chromic, photovoltaic, photocatalytic, sensing, electrolyte-gated TFTs, and power storage applications are established in this chapter. The main focus is given on how to perform the material selection and formulation of printable dispersion in order to develop functional films for electrochemical applications.This chapter is divided into four main parts. Firstly, a brief introduction on electrochemically active nanocrystalline metal oxide films developed via printing techniques is given. This is followed by the description of the film morphology, structure, and required functionality. A theoretical approach to understand the impact of size and shape of nanoparticles on an ink formulation and electrochemical performance being the subject of the third section provides a greater control over the material selection. We attempt to describe these properties and show that for a given material, geometry and size of the nanoparticles have a major influence on the electrochemical reactivity and response time. This gives the ability to tune the performance of the film simply by varying the morphology of incorporated nanostructures. This section is completed by the recommendations on each major step of an ink formulation, together with imposed critical constraints concerning the fluid control. Finally, the performance of the ink-jet-printed dual-phase electrochromic films is discussed as a case study.By providing such a rather systematic survey, we aim to stress the importance of proper design strategy that would result in both improved physicochemical properties of nanoparticle-loaded inks and enhanced electrochemical performance of printed functional films.

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“…The device integrates an amorphous/nanocrystalline biosensor and a light emission source with the non-cross-linking method for specific DNA detection. This low cost, fast and simple optoelectronic platform was optimized for the specific identification of MTBC members and the consequent improvement of the laboratorial diagnostics algorithms of TB (Bernacka-Wojcik, et al, 2010;Silva et al, 2008Silva et al, , 2010. The integration of these technologies together with the possibility of miniaturization are of utmost importance for the development of an integrated biosensor suitable for peripheral laboratories and/or point-of-care diagnostics, providing a new tool in the fight against TB.…”

Section: Noble Metal Nanoparticlesmentioning

confidence: 99%