Self-Doped Rutile Titania with High Performance for Direct and Ultrafast Assay of H₂O₂

Abstract

Detection of H2O2 is important for the applications in environmental protection, pharmaceutical industries, food production, and clinical control. Current colorimetric assay of H2O2 based on enzyme or nanomaterials always needs TMB or other peroxidase substrate as coloration species. Furthermore, the corresponding response time including incubation process is in order of minute. In this study, we report on the synthesis of heavily Ti(3+)-doped TiO2 composed of spherelike nanoparticles by pulsed laser ablation method. This TiO2 can directly detect H2O2 without using TMB or any other peroxidase substrate and is free from incubation process. In addition, the detection sensitivity is compatible with or better than that of the natural enzyme or other nanomaterials. Hence, the self-doped TiO2 nanoparticles provide a novel, direct, ultrafast approach for H2O2 assay application.

Electronic Reconstruction of α-Ag2WO4 Nanorods for Visible-Light Photocatalysis

“…Laser ablation in liquid (LAL) is a promising technique for preparing metastable and defective materials because of the far-from thermodynamic equilibrium process in the generated plasma plumes. 19,20,21 A lot of functional nanomaterials and nanostructures have been fabricated successfully by LAL for practical application in recent years. 22,23,24 Thus, LAL can be expected to realize the goal that modify AWO itself to be sensitive to visible light.…”

Recent Advances in Surfactant‐Free, Surface‐Charged, and Defect‐Rich Catalysts Developed by Laser Ablation and Processing in Liquids

“…Compared with annealed rutile TiO 2 , oxygen vacancies of the LAL-synthesized TiO 1. 67 NPs induce ac lear blueshift ( % 15 cm À1 )a nd broadening of the band gap band in the Raman spectra (Figure 10 Overall, LAL and LPL are efficient for the introduction of more than 40 %T i 3 + ,t hat is, > 20 %o xygen vacancies, in both anatase and rutile TiO 2 NPs, [118,119] but little is known about where the oxygen vacancies stay in the LAL-/LFL-synthesized defect-rich TiO 2 NPs. Theoretical calculations demonstrate that the oxygen vacanciesm ay either stay at the subsurfaces or at the surfaces, depending on the TiO 2 phase.…”

“…The as-prepared TiO 2 colloid is stable with az eta-potential value of À59 mV.B oth XPS and EPR spectra have confirmed the introductiono fT i 3 + speciesi nto rutile TiO 2 (Figure 9). [118] The binding energy peaks of pristine TiO 2 at 458.9 and 464.7 eV correspond to the 2p 3/2 and 2p 1/2 core levels of Ti 4 + ,r espectively.A fter laser irradiation,t he peaks shift to lower energies, owing to the formation of Ti 3 + at binding energies of 458.2 and 462.5 eV,which correspond to t2p 3/2 and 2p 1/2 core levelso fT i 3 + ,r espectively (Figure 9a). The presence of Ti 3 + also induces an apparent EPR signal, whereas, in comparison, no signali so bserved fort he pristine TiO 2 educt (Figure 9b).…”

“…[117] Introducing oxygen vacancies into rutile TiO 2 has been realized by LFL of TiO 2 micropowders in water by using aU V laser. [118] Specificl aser parameters are aw avelength of 355 nm, pulse duration of 6ns, repetition of 10 Hz, laser fluence of about 1Jpulse À1 cm À2 .A fter about 10 min of LFL, the white emulsion of raw rutile TiO 2 powder becomes transparent and the colloidal color changes to blue. Meanwhile, the size is reduced from 60 to 30 nm.…”

“…Through calculating the ratio of areas of the Ti 3 + peak to the overall areas of the Ti 3 + and Ti 4 + peaks in the XPS spectra, Pan et al showedt hat the Ti 3 + /(Ti 3 + + Ti 4 + )a tomicr atio could be as high as 49 %. [118]…”