Near-infrared photocatalysis based on YF3 : Yb3+,Tm3+/TiO2 core/shell nanoparticles

Qin, Weiping; Zhang, Daisheng; Zhao, Dan; Wang, Lili; Zheng, Kezhi

doi:10.1039/b924052g

Cited by 356 publications

(217 citation statements)

References 26 publications

Supporting

Mentioning

213

Contrasting

Unclassified

Order By: Relevance

“…These converted UV and visible emissions can be reabsorbed by TiO 2 and Au NPs, respectively, and used for photocatalysis. Although there are a few papers reporting NIR photocatalysis driven by upconversion, [28][29][30][31][32][33] using plasmonic NPs to further improve the photocatalysis effi ciency under NIR irradiation has not been demonstrated. The appropriate combination of lanthanide-doped upconverting particles and Au NPs with strongly catalytic TiO 2 into single architectures may allow the use of fascinating plasmonic and upconversion properties to effi ciently harvest photons from UV, to visible and further to NIR for photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF₄, TiO₂, and Au

Quintanilla

Vetrone

et al. 2015

Adv Funct Materials

273

206

View full text Add to dashboard Cite

1wileyonlinelibrary.com uniform core@shell structures with highly functional inner core and porous outer shell by a simple approach.Titanium dioxide (TiO 2 ) has been a semiconductor material of signifi cant research interest due to its fascinating features, such as nontoxicity, good chemical and thermal stability, and excellent electronic, optical, and catalytic properties, [ 5,6 ] which render it a greatly promising material in photocatalysis for the removal of inorganic and organic pollutants, [ 7 ] and for hydrogen generation, [ 8 ] as well as in dye-sensitized solar cells. [ 9 ] However, TiO 2 has a bandgap of 3.0-3.2 eV, and mainly absorbs ultraviolet (UV) light, which accounts for only ≈5% of the incoming solar energy. [ 10,11 ] Therefore, photons with energy lower than the band gap energy of TiO 2 , that is, more than 90% of the solar energy, cannot be harvested for photocatalysis. Furthermore, the fast recombination of charge carriers signifi cantly reduces the catalytic activity in practical applications. To resolve these problems, much effort, including metal-ion, and nonmetal doping, [ 12 ] dye sensitization, [ 13 ] and coupling with narrower band gap semiconductors, [ 14 ] has been undertaken toward developing the next-generation of TiO 2 -based materials. These methods have been able to extend the absorption of TiO 2 -based photocatalysts into the visible region to some extent and/or enhance the charge separation. However, to date, the photocatalytic performance of these materials remains poor and in general, they also suffer from thermal instability and photocorrosion, and are not environmentally friendly. [ 15 ] Therefore, it is challenging, yet highly desirable to develop a simple method for synthesizing a photocatalyst, which can absorb solar photons over a broad wavelength range and show largely improved photocatalytic activity, as well as overcome other problems mentioned above.Au nanoparticles (NPs) show unique, size-tunable surface plasmon resonance (SPR) in the visible range, offering a new opportunity to overcome the limits of current photocatalysts. [16][17][18] -core@porous-TiO 2 -shell microspheres is reported. They exhibit high surface area, good stability, broadband absorption from ultraviolet to near infrared, and excellent photocatalytic activity, signifi cantly better than the benchmark P25 TiO 2 . The enhanced activity is attributed to synergistic effects from nanocomponents arranged into the nanostructured architecture in such a way that favors the effi cient charge/energy transfer among nanocomponents and largely reduced charge recombination. Optical and energy-transfer properties are modeled theoretically to support our interpretations of catalytic mechanisms. In addition to yielding novel materials and interesting properties, the current work provides physical insights that can contribute to the future development of plasmon-enhanced broadband catalysts.

show abstract

Section: Introductionmentioning

confidence: 99%

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF₄, TiO₂, and Au

Quintanilla

Vetrone

et al. 2015

Adv Funct Materials

273

206

View full text Add to dashboard Cite

show abstract

“…These upconversion nanoparticles are usually made of host lattices of ceramic materials, such as LaF 3 , YF 3 , Y 2 O 3 , LaPO 4 , NaYF 4 embedded with trivalent lanthanide ions like Yb 3þ , Er 3þ , and Tm 3þ and show a unique phenomenon of absorbing NIR light and emitting UV, visible, and NIR light (10). There are a few reports exploiting NIR-to-NIR and NIRto-visible upconversion nanoparticles (UCNs) (11)(12)(13)(14); however, the use of NIR-to-UV UCNs is minimally explored (15)(16)(17).…”

mentioning

confidence: 99%

Remote activation of biomolecules in deep tissues using near-infrared-to-UV upconversion nanotransducers

Jayakumar

Idris

Zhang

2012

Proc. Natl. Acad. Sci. U.S.A.

343

255

View full text Add to dashboard Cite

Controlled activation or release of biomolecules is very crucial in various biological applications. Controlling the activity of biomolecules have been attempted by various means and controlling the activity by light has gained popularity in the past decade. The major hurdle in this process is that photoactivable compounds mostly respond to UV radiation and not to visible or near-infrared (NIR) light. The use of UV irradiation is limited by its toxicity and very low tissue penetration power. In this study, we report the exploitation of the potential of NIR-to-UV upconversion nanoparticles (UCNs), which act as nanotransducers to absorb NIR light having high tissue penetration power and negligible phototoxicity and emit UV light locally, for photoactivation of caged compounds and, in particular, used for photo-controlled gene expression. Both activation and knockdown of GFP was performed in both solution and cells, and patterned activation of GFP was achieved successfully by using upconverted UV light produced by NIR-to-UV UCNs. In-depth photoactivation through tissue phantoms and in vivo activation of caged nucleic acids were also accomplished. The success of this methodology has defined a unique level in the field of photo-controlled activation and delivery of molecules.

show abstract

“…Qin et al [54] have reported a NIR photocatalysis based on YF 3 :Yb 3+ ,Tm 3+ /TiO 2 core/shell nanoparticles. These nanoparticles were synthesized by a modified hydrolysis method using PVP as a coupling agent.…”

Section: Recent Progress In Upconversion-assisted Photocatalysismentioning

confidence: 99%

Upconversion Nanoparticles for Other Applications

Zhang

2014

Photon Upconversion Nanomaterials

View full text Add to dashboard Cite

Besides various bio-applications such as biomedicine, bioassay, photon dynamic treatment, and drug delivery, UCNPs have also been used in other applications. They can be explored as a NIR absorber in solar cells because they can absorb NIR light which has been wasted in traditional solar cells. They can be used as sensitizer in photocatalysis due to the energy transfer from UCNPs to the quantum dots or organic dyes. They are considered as next generation anti-counterfeiting materials due to their unique optical properties. In this chapter, the recent progress on other applications (besides bio-application) based on UCNPs is reviewed.Keywords Upconversion nanoparticles Á Solar cell Á Photocatalysis Á Anticounterfeiting materials Á NIR absorber Á Light harvesting Á Downconversion luminescence IntroductionAs was discussed in pervious chapters, UCNPs have attracted a great deal of attention from researchers because of their potential for optical manipulation in many fields (such as temperature sensors, bio-imaging agents, bio-analysis agents, and optical trigger for nanocapsules in medical therapy) [1][2][3]. In addition, UCNPs are widely used in light harvesting (for instance in photovoltaic cells and photosynthesis/photocatalytic reactions) and security applications due to their unique optical properties. This chapter will focus on the applications of UCNPs other than their bioapplications and give a brief review on their mechanisms, manipulative methods, and future development.Rui Wang and Fan Zhang contributed together to this chapter.

show abstract

Near-infrared photocatalysis based on YF3 : Yb3+,Tm3+/TiO2 core/shell nanoparticles

Cited by 356 publications

References 26 publications

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF₄, TiO₂, and Au

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF₄, TiO₂, and Au

Remote activation of biomolecules in deep tissues using near-infrared-to-UV upconversion nanotransducers

Upconversion Nanoparticles for Other Applications

Contact Info

Product

Resources

About

Near-infrared photocatalysis based on YF3 : Yb3+,Tm3+/TiO2 core/shell nanoparticles

Cited by 356 publications

References 26 publications

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF4, TiO2, and Au

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF4, TiO2, and Au

Remote activation of biomolecules in deep tissues using near-infrared-to-UV upconversion nanotransducers

Upconversion Nanoparticles for Other Applications

Contact Info

Product

Resources

About

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF₄, TiO₂, and Au

Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF₄, TiO₂, and Au