A multi-step mechanism and integrity of titanate nanoribbons

Bellat, Vanessa; Chassagnon, R.; Heintz, O.; Saviot, Lucien; Vandroux, David; Millot, Nadine

doi:10.1039/c4dt02573c

Cited by 16 publications

(8 citation statements)

References 77 publications

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“…The coupling of strain into a material will modify local stretch modes, hence enabling Raman spectroscopy as a sensitive tool for identifying strain in materials with distinct Raman modes. Similar to previous reports on heat treated NiTi alloys 33 we find the Raman spectra of the nanostructured surface oxide to exhibit a strong peak near 269 cm −1 attributed to the titanate mode which are the Raman active modes of NiTiO 3 34 35 36 37 , peaks centered on 300 cm −1 and 342 cm −1 attributed to the E g modes of NiTiO 3 38 39 40 41 , and a peak near 454 cm −1 attributed to the E g mode of rutile phase TiO 2 42 43 . Whereas shifts and mode-splitting can be observed in these peaks as a function of applied strain, statistical Raman maps over large areas of the surface (800–1000 total Raman scans in each map) were performed to quantify strain-related shifts observed in the active materials, specifically for the modes identified in Fig.…”

Section: Spectroscopic Strain Analysissupporting

confidence: 89%

Strain Engineering to Modify the Electrochemistry of Energy Storage Electrodes

Muralidharan

Carter

Oakes

et al. 2016

Sci Rep

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Strain engineering has been a critical aspect of device design in semiconductor manufacturing for the past decade, but remains relatively unexplored for other applications, such as energy storage. Using mechanical strain as an input parameter to modulate electrochemical potentials of metal oxides opens new opportunities intersecting fields of electrochemistry and mechanics. Here we demonstrate that less than 0.1% strain on a Ni-Ti-O based metal-oxide formed on superelastic shape memory NiTi alloys leads to anodic and cathodic peak potential shifts by up to ~30 mV in an electrochemical cell. Moreover, using the superelastic properties of NiTi to enable strain recovery also recovers the electrochemical potential of the metal oxide, providing mechanistic evidence of strain-modified electrochemistry. These results indicate that mechanical energy can be coupled with electrochemical systems to efficiently design and optimize a new class of strain-modulated energy storage materials.

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Section: Spectroscopic Strain Analysissupporting

confidence: 89%

Strain Engineering to Modify the Electrochemistry of Energy Storage Electrodes

Muralidharan

Carter

Oakes

et al. 2016

Sci Rep

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“…A small number of nanoribbons were also present with their characteristic vibrations at 175 and 198 cm −1 . [21a,33b,34]…”

Section: Resultsmentioning

confidence: 99%

Taxane‐Grafted Metal‐Oxide Nanoparticles as a New Theranostic Tool against Cancer: The Promising Example of Docetaxel‐Functionalized Titanate Nanotubes on Prostate Tumors

Loiseau

Boudon

Mirjolet

et al. 2017

Adv Healthcare Materials

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The combination of anticancer drugs and metal oxide nanoparticles is of great interest in cancer nanomedicine. Here, the development of a new nanohybrid, titanate nanotube-docetaxel (TiONts-DTX) is reported, the two parts of which are conjugated by covalent linkages. Unlike most nanoparticles currently being developed for biomedical purposes, TiONts present a needle-shaped morphology. The surface of TiONts is linked with 3-aminopropyl triethoxysilane and with a hetero-bifunctional polymer (polyethylene glycol) to create well-dispersed and biocompatible nanovectors. The prefunctionalized surface of this scaffold has valuable attachments to graft therapeutic agents (DTX in our case) as well as chelating agents (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) to monitor the nanohybrids. To evaluate drug efficacy, in vitro tests have demonstrated that the association between TiONts and DTX shows cytotoxic activity against a hormone-refractory prostate cancer cell line (22Rv1) whereas TiONts without DTX do not. Finally, the first in vivo tests with intratumoral injections show that more than 70% of TiONts nanovectors are retained within the tumor for at least 7 d. Moreover, tumor growth in mice receiving TiONts-DTX is significantly slower than that in mice receiving free DTX. This nanohybrid can thus become a promising new tool in biomedicine to fight against prostate cancer.

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“…Recent reports have shown that as the nature of the TiO 2 precursors varies, the attributes of the nanobelts derived from them change significantly. 25 The TiO 2 nanobelts (CSTNB) were synthesized using combustion synthesized TiO 2 as a novel precursor. Ag 3 PO 4 has been impregnated on these TiO 2 nanobelts by the simple co-precipitation technique.…”

Section: Introductionmentioning

confidence: 99%

Enhanced sunlight photocatalytic activity of Ag3PO4 decorated novel combustion synthesis derived TiO2 nanobelts for dye and bacterial degradation

Eswar

Ramamurthy

Madras

2015

Photochem Photobiol Sci

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This study demonstrates the synthesis of TiO2 nanobelts using solution combustion derived TiO2 with enhanced photocatalytic activity for dye degradation and bacterial inactivation. Hydrothermal treatment of combustion synthesized TiO2 resulted in unique partially etched TiO2 nanobelts and Ag3PO4 was decorated using the co-precipitation method. The catalyst particles were characterized using X-ray diffraction analysis, BET surface area analysis, diffuse reflectance and electron microscopy. The photocatalytic properties of the composites of Ag3PO4 with pristine combustion synthesized TiO2 and commercial TiO2 under sunlight were compared. Therefore the studies conducted proved that the novel Ag3PO4/unique combustion synthesis derived TiO2 nanobelt composites exhibited extended light absorption, better charge transfer mechanism and higher generation of hydroxyl and hole radicals. These properties resulted in enhanced photodegradation of dyes and bacteria when compared to the commercial TiO2 nanocomposite. These findings have important implications in designing new photocatalysts for water purification.

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A multi-step mechanism and integrity of titanate nanoribbons

Cited by 16 publications

References 77 publications

Strain Engineering to Modify the Electrochemistry of Energy Storage Electrodes

Strain Engineering to Modify the Electrochemistry of Energy Storage Electrodes

Taxane‐Grafted Metal‐Oxide Nanoparticles as a New Theranostic Tool against Cancer: The Promising Example of Docetaxel‐Functionalized Titanate Nanotubes on Prostate Tumors

Enhanced sunlight photocatalytic activity of Ag3PO4 decorated novel combustion synthesis derived TiO2 nanobelts for dye and bacterial degradation

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