Carbon monoxide annealed TiO<sub>2</sub>nanotube array electrodes for efficient biosensor applications

Zhang, Yunhuai; Xiao, Peng; Zhou, Xiaoyuan; Liu, Dawei; García, Betzaida Batalla

doi:10.1039/b818620k

Cited by 137 publications

(127 citation statements)

References 35 publications

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“…As shown in Figure 4, it was found that the two characteristic peaks of Ti2p 1/2 was at ~465 eV and Ti2p 3/2 was at 459 eV in TNTs/air, 23,35,36 but there was obvious shift to low binding energy in the two peak positions binding energy peaks of TNTs/N 2 . This strongly suggested that Ti 4+ had trends into transform to lower valence due to the loss of oxygen annealing in N 2 .…”

Section: Resultsmentioning

confidence: 96%

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO₂Nanotubes Aggregation

Liu¹,

Lu²,

He³

et al. 2012

Bulletin of the Korean Chemical Society

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Aggregation of titania nanotubes (TNTs) fabricated by hydrothermal method were calcined in air and dry nitrogen; Changes in morphology and crystallinity of the nanotubes were studied by means of TEM, EDX, and XPS. EDX patterns and XPS spectra proved that there were a certain densities of oxygen vacancies in TNTs annealed in N 2 . The photocatalysis experiments revealed TNTs/N 2 possesses significantly higher photocatalytic efficiency than TNTs annealed in dry air to degrade methylene blue. The correlation between oxygen vacancies and photocatalytic property may be attributed to: 1) oxygen vacancies might have affected results on water molecules adsorption and increase of the hydroxyl concentration; and 2) oxygen vacancies resulted in some changes in electronic structure of TNTs/N 2 aggregation and Fermi level extends into the conducting band.

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Section: Resultsmentioning

confidence: 96%

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO₂Nanotubes Aggregation

Liu¹,

Lu²,

He³

et al. 2012

Bulletin of the Korean Chemical Society

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“…• (as shown in the right inset of figure 2,table1) [13]. Figure 3 is the SEM image of the ordered silica spheres on the PDMS film but coated with Ag NPs.…”

Section: Resultsmentioning

confidence: 99%

“…been constructed usually based on two essential concerns: (i) micro-and nanoscale hierarchical structures to increase the roughness of a surface [10] and (ii) chemical modification to reduce the surface energy of a rough surface [11]. Based on these two principles, various techniques have been established to engineer superhydrophobic surfaces, with notable examples including lithographic patterning [12], layerby-layer techniques [13,14], electrochemical deposition [15], sol-gel approach [16], electrospinning and plasma etching/deposition [17][18][19][20][21]. Through these approaches, lots of superhydrophobic materials have been fabricated.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of flexible superhydrophobic films by lift-up soft-lithography and decoration with Ag nanoparticles

et al. 2009

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Superhydrophobic films with excellent flexibility have been fabricated by combining the lift-up soft-lithography technique and chemical reduction of [Ag(NH 3 ) 2 ] + ions to Ag nanoparticles (NPs) on the surface of silica spheres which are patterned on the polydimethylsiloxane (PDMS) films. Scanning electron microscopy (SEM) images reveal the presence of raspberry-like hierarchical structures on the PDMS films. The influence of the amount of Ag NPs and the size of the silica spheres on the wettability of the soft films is investigated carefully. Because PDMS films are elastomeric materials, our superhydrophobic films offer great flexibility. The resulting films can be easily transferred from one substrate surface to another without destroying their superhydrophobicity. These flexible and superhydrophobic films can be used repeatedly to satisfy a wide range of applications.

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“…Immobilization in this case is achieved via electrostatic interactions between the negatively charged TiO 2 surface and an IgG analyte for trinitrotoluene detection in the pH range 2-12. Antibodies for prostate-specifi c antigens have been immobilized on modifi ed TiO 2 substrates [71]. Th e effi ciency of this optical immunoassay-based biosensor is dependent on the silanization of the hydroxylated TiO 2 substrate.…”

Section: Antibody-immobilized Nmo-based Immunosensorsmentioning

confidence: 99%

Nanostructured metal oxide-based biosensors

et al. 2011

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A mong the various types of nanomaterials that have been developed, nanostructured metal oxides (NMOs) have recently aroused much interest as immobilizing matrices for biosensor development ( Figure 1) [1][2][3][4][5][6][7][8][9]. Nanostructured oxides of metals such as zinc, iron, cerium, tin, zirconium, titanium, metal and magnesium have been found to exhibit interesting nanomorphological, functional biocompatible, non-toxic and catalytic properties. Th ese materials also exhibit enhanced electron-transfer kinetics and strong adsorption capability, providing suitable microenvironments for the immobilization of biomolecules and resulting in enhanced electron transfer and improved biosensing characteristics. Various morphologies of NMOs have been obtained using a variety of methods, including soft templating for the preparation of nanorods and nanofi bers [10], sol-gel methods for the production of three-dimensional (3D) ordered rough nanostructures [6,11], radiofrequency sputtering for rough nanostructures [4] and hydrothermal deposition for nanoparticles with controlled shape [12]. All of these NMOs have been reported to have potential applications in biosensors. Recently, the optical, electrical and magnetic properties of NMOs have been reported to be enhanced through the incorporation of nanoparticles of conducting or semiconducting materials such as carbon nanotubes, graphene, gold and silver, as well as quantum dots of various semiconductors, with advantages for improved biosensor characteristics [13][14][15][16]. It is expected that the judicious application of an NMO may lead to the fabrication of novel biosensing devices with enhanced signal amplifi cation and coding strategies for bioaffi nity assays and effi cient electrical communication with redox biomolecules/ enzymes that may address future diagnostic needs.Th e unique properties of NMOs off er excellent prospects for interfacing biological recognition events with electronic signal transduction and for designing a new generation of bioelectronics devices that may exhibit novel functions. Th e controlled preparation of an NMO is considered to play a signifi cant role in the development of biosensors. Eff orts are being made to explore the prospects and future challenges of NMOs for the development of biosensing devices and the evolution of new strategies for bioaffi nity assays and effi cient electrical communication. In this review, we focus on developments over the past fi ve years in NMO-based biosensors for clinical and non-clinical applications (Figure 2). Fundamentals of nanostructured metal oxides for biosensingAmong the various immobilizing matrices that have been developed, NMOs have exceptional optical and electrical properties due to electron and phonon confi nement, high surface-to-volume ratios, modifi ed surface work function, high surface reaction activity, high catalytic effi ciency and strong adsorption ability. For these reasons, NMOs have been utilized to increase the loading of biomolecules per Nanostructured metal oxide-based b...

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Carbon monoxide annealed TiO₂nanotube array electrodes for efficient biosensor applications

Cited by 137 publications

References 35 publications

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO₂Nanotubes Aggregation

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO₂Nanotubes Aggregation

Fabrication of flexible superhydrophobic films by lift-up soft-lithography and decoration with Ag nanoparticles

Nanostructured metal oxide-based biosensors

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Carbon monoxide annealed TiO2nanotube array electrodes for efficient biosensor applications

Cited by 137 publications

References 35 publications

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO2Nanotubes Aggregation

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO2Nanotubes Aggregation

Fabrication of flexible superhydrophobic films by lift-up soft-lithography and decoration with Ag nanoparticles

Nanostructured metal oxide-based biosensors

Contact Info

Product

Resources

About

Carbon monoxide annealed TiO₂nanotube array electrodes for efficient biosensor applications

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO₂Nanotubes Aggregation

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO₂Nanotubes Aggregation