title: Preparation and near-infrared photothermal conversion property of cesium tungsten oxide nanoparticles.
abstract: Cs0.33WO3 nanoparticles have been prepared successfully by a stirred bead milling process. By grinding micro-sized coarse powder with grinding beads of 50 μm in diameter, the mean hydrodynamic diameter of Cs0.33WO3 powder could be reduced to about 50 nm in 3 h, and a stable aqueous dispersion could be obtained at pH 8 via electrostatic repulsion mechanism. After grinding, the resulting Cs0.33WO3 nanoparticles retained the hexagonal structure and had no significant contaminants from grinding beads. Furthermore, they exhibited a strong characteristic absorption and an excellent photothermal conversion property in the near-infrared (NIR) region, owing to the free electrons or polarons. Also, the NIR absorption and photothermal conversion property became more significant with decreasing particle size or increasing particle concentration. When the concentration of Cs0.33WO3 nanoparticles was 0.08 wt.%, the solution temperature had a significant increase of above 30°C in 10 min under NIR irradiation (808 nm, 2.47 W/cm2). In addition, they had a photothermal conversion efficiency of about 73% and possessed excellent photothermal stability. Such an effective NIR absorption and photothermal conversion nanomaterial not only was useful in the NIR shielding, but also might find great potential in biomedical application.
authors: Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan. chendh@mail.ncku.edu.tw.
authors: Cheng-Jia
authors: CJ
authors: Chen
authors: Dong-Hwang
authors: DH
authors: Chen
references: Cancer Res. 2010 Dec 1;70(23):9855-64
references: 21098701
references: Nano Lett. 2007 May;7(5):1318-22
references: 17430005
references: Nat Nanotechnol. 2009 Nov;4(11):773-80
references: 19893526
references: Biomaterials. 2011 Feb;32(4):1121-9
references: 21071083
references: Nano Lett. 2009 Mar;9(3):1139-46
references: 19193041
references: ACS Appl Mater Interfaces. 2011 Jul;3(7):2794-9
references: 21675747
references: J Am Chem Soc. 2006 Feb 15;128(6):2115-20
references: 16464114
references: Proc Natl Acad Sci U S A. 2005 Aug 16;102(33):11600-5
references: 16087878
references: Inorg Chem. 2012 Apr 16;51(8):4763-71
references: 22443484
references: Biomaterials. 2011 Jan;32(1):144-51
references: 20888630
references: Annu Rev Phys Chem. 2003;54:331-66
references: 12626731
references: Chem Commun (Camb). 2012 Dec 7;48(94):11567-9
references: 23090583
references: Small. 2007 Apr;3(4):691-9
references: 17299826
references: Proc Natl Acad Sci U S A. 2003 Nov 11;100(23):13549-54
references: 14597719
references: J Am Chem Soc. 2002 Sep 4;124(35):10596-604
references: 12197762
references: J Am Chem Soc. 2011 May 4;133(17):6825-31
references: 21476500
references: Nanoscale. 2012 Jun 7;4(11):3394-8
references: 22543744
references: Langmuir. 2011 Oct 4;27(19):12172-8
references: 21870876
references: ACS Nano. 2009 Oct 27;3(10):2941-52
references: 19856978
references: Chem Commun (Camb). 2011 Aug 21;47(31):8853-5
references: 21748146
references: Biomaterials. 2012 Apr;33(11):3235-42
references: 22296829
references: Adv Mater. 2011 Dec 1;23(45):5392-7
references: 21997882
references: Small. 2010 Oct 18;6(20):2272-80
references: 20827680
references: Adv Mater. 2012 Mar 15;24(11):1418-23
references: 22318874
references: J Am Chem Soc. 2011 Jun 8;133(22):8506-9
references: 21563806