Luminescence and surface effects of closed-shell transition metal ions in sol-gel silica glasses

In this paper, TiO2crystallines doped with transition metal ions have been prepared by sol-gel method. The UV-visible spectra indicated that the doping with transition metal ions (especially Cu2+, Mn2+and Cr3+ions) could effectively improve the absorption of TiO2crystals in the visible-light range. The XRD results showed that the doping does not affect the anatase phase of TiO2. The band structure and the UV-vis absorption spectrum of Mn2+ions doped-TiO2were also calculated by DFT (density function theory) method, which indicated that the doping with transition metal ion could make the band gap of TiO2smaller and a red shift in optical absorption.

Download Full-text

Quenching of Lanthanide Emission by Intervalence Charge Transfer in Crystals Containing Closed Shell Transition Metal Ions

Spectroscopy Letters ◽

10.1080/00387010701247019 ◽

2007 ◽

Vol 40 (2) ◽

pp. 209-220 ◽

Cited By ~ 46

Author(s):

Philippe Boutinaud ◽

Piotr Putaj, ◽

Rachid Mahiou ◽

Enrico Cavalli ◽

Adolfo Speghini ◽

...

Keyword(s):

Charge Transfer ◽

Transition Metal ◽

Metal Ions ◽

Closed Shell ◽

Transition Metal Ions ◽

Intervalence Charge Transfer

Download Full-text

Sol–gel synthesis of transition-metal ion conjugated alumina-rich mullite nanocomposites with potential mechanical, dielectric and photoluminescence properties

RSC Advances ◽

10.1039/c5ra21091g ◽

2015 ◽

Vol 5 (126) ◽

pp. 104299-104313 ◽

Cited By ~ 13

Author(s):

Arpan Kool ◽

Pradip Thakur ◽

Biswajoy Bagchi ◽

Nur Amin Hoque ◽

Somtirtha Banerjee ◽

...

Keyword(s):

Transition Metal ◽

Metal Ions ◽

Metal Ion ◽

Sol Gel ◽

Transition Metal Ions ◽

Photoluminescence Properties ◽

Transition Metal Ion ◽

Sol Gel Synthesis

Mechanical, dielectric and photoluminescence properties of transition-metal ions doped mullite nanocomposite synthesized via alkoxide hydrolysis.

Download Full-text

Metal ‘turn-off’, anion ‘turn-on’ gelation cascade in pyridinylmethyl ureas

Chemical Communications ◽

10.1039/c6cc09126a ◽

2017 ◽

Vol 53 (12) ◽

pp. 2024-2027 ◽

Cited By ~ 17

Author(s):

Caroline A. Offiler ◽

Christopher D. Jones ◽

Jonathan W. Steed

Keyword(s):

Transition Metal ◽

Metal Ions ◽

Sol Gel ◽

Transition Metal Ions ◽

Turn On

Pyridinylmethyl urea gels are weakened or destroyed by addition of transition metal ions but gelation is recovered by adding bromide giving rise to a gel–sol–gel chemically triggered cascade.

Download Full-text

Hybrid sol–gel coatings doped with transition metal ions for the protection of AA 2024-T3

Journal of Sol-Gel Science and Technology ◽

10.1007/s10971-011-2666-6 ◽

2012 ◽

Vol 61 (3) ◽

pp. 600-612 ◽

Cited By ~ 23

Author(s):

Alexandra Wittmar ◽

Matthias Wittmar ◽

Alfred Ulrich ◽

Hinka Caparrotti ◽

Michael Veith

Keyword(s):

Transition Metal ◽

Metal Ions ◽

Sol Gel ◽

Transition Metal Ions ◽

Aa 2024

Download Full-text

Study of Photocatalytic Activity and Properties of Transition Metal Ions Doped Nanocrystalline TiO2Prepared by Sol-Gel Method

Advances in Materials Science and Engineering ◽

10.1155/2014/462198 ◽

2014 ◽

Vol 2014 ◽

pp. 1-4 ◽

Cited By ~ 9

Author(s):

K. S. Siddhapara ◽

D. V. Shah

Keyword(s):

Photocatalytic Activity ◽

Transition Metal ◽

Metal Ions ◽

Uv Light ◽

Sol Gel ◽

Visible Region ◽

Transition Metal Ions ◽

Gel Method ◽

X Ray ◽

Sol Gel Method

Transition metal (Mn, Fe, Co,) doped TiO2nanoparticles were synthesized by the sol-gel method. All the prepared samples were calcined at different temperatures like 200°C to 800°C and characterized by X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis. The studies revealed that transition metal (TM) doped nanoparticles have smaller crystalline size and higher surface area than pure TiO2. Dopant ions in the TiO2structure caused significant absorption shift into the visible region. The results of photodegradation of formaldehyde in aqueous medium under UV light showed that photocatalytic activity of TiO2nanoparticles was significantly enhanced by the presence of some transition metal ions. Chemical oxygen demand (COD) of formaldehyde solutions done at regular intervals gave a good idea about mineralization of formaldehyde.

Download Full-text