采用乙醇作为诱导剂，利用简单的低温水热合成法在木材表面原位生长无机WO3纳米片，探讨WO3/木材的光响应功能。使用扫描电镜（SEM）、X射线衍射（XRD）、紫外-可见光（UV-vis）、色差仪和热重分析（TG）分别表征了此复合材料形貌、相结构、紫外光吸收、光响应和热稳定性能，并进一步探讨了此复合材料的疏水功能。SEM表明WO3纳米片均匀的生长在木材表面；XRD表明WO3具有六方晶相结构；UV-vis表明WO3处理后的木材与素材相比，其最大吸收波长出现蓝移；光响应测试表明，WO3/木材在紫外光照射下具有明显的变色功能；TG表明WO3涂层对木材成分降解起到一定的抑制作用。此外，经过十八烷基三氯硅烷改良后，此复合材料具有超疏水功能。
The tungsten trioxide with sheet-like nanostructures is grown on wood surfaces via a simple low-temperature hydrothermal method with ethanol as an inducer. The photoresponsive functions of the WO3/wood are discussed. The morphologies, the phase structure, the ultraviolet(UV) absorption, the photoresponse and the thermal stability are characterized by using the scanning electron microscopy(SEM), the X-ray diffraction(XRD), the ultraviolet-visible(UV-vis) light, the color difference meter and the thermogravimetry(TG) analysis, respectively, and the hydrophobic property is also measured. The SEM results show that the WO3 nanosheets are uniformly grown on the wood surfaces. The XRD results further reveal that the WO3 is highly crystallized with a hexagonal structure. The UV-vis analysis shows that the obtained sample sees a remarkable blue shift compared with the pristine wood. The photoresponsive tests show that the sample has an obvious photochromic function under the UV light irradiation. The TG analysis shows that the WO3 coatings can restrain the degradation of the wood components. In addition, the composite possesses the superhydrophobic property through the octadecyltrichlorosilane(OTS) treatment.
[1] Worgull M,Schneider M,Röhrig M,et al.Hot embossing and thermo-forming of biodegradable three-dimensional wood structures[J].RSC Ad-vances,2013,3(43):20060-20064.
[2] Qu M,Pelkonen P,Tahvanainen L,et al.Experts'assessment of the de-velopment of wood framed houses in China[J].Journal of Cleaner Pro-duction,2012,31:100-105.
[3] Hoque M E,Aminudin M A M,Jawaid M,et al.Physical,mechanical,and biodegradable properties of meranti wood polymer composites[J].Materials & Design,2014,64:743-749.
[4] Wang L,Toppinen A,Juslin H.Use of wood in green building:A study of expert perspectives from the UK[J].Journal of Cleaner Production,2014,65:350-361.
[5] Hui B,Li Y,Huang Q,et al.Fabrication of smart coatings based on wood substrates with photoresponsive behavior and hydrophobic perfor-mance[J].Materials & Design,2015,84:277-284.
[6] Li J,Han S J,Xu Z C,et al.Surface deterioration and protection of lig-nocellulosic material[J].Journal of Northeast Forestry University,1989,17(2):48-56.
[7] Sun Q F,Yu H P,Liu Y X,et al.Prolonging the combustion duration of wood by TiO2 coating synthesized using cosolvent-controlled hydro-thermal method[J].Journal of Material Science,2010,45(24):6661-6667.
[8] Hui B,Li J,Wang L.Electromagnetic shielding wood-based composite from electroless plating corrosion-resistant Ni-Cu-P coatings on Fraxi-nus mandshurica veneer[J].Wood Science and Technology,2014,48(5):961-979.
[9] Hui B,Li G,Han G,et al.Fabrication of magnetic response composite based on wood veneers by a simple in situ synthesis method[J].Wood Science and Technology,2015,49(4):755-767.
[10] Santato C,Ulmann M,Augustynski J.Photoelectrochemical properties of nanostructured tungsten trioxide films[J].Journal of Physical Chem-istry B,2001,105(5):936-940.
[11] Su J,Feng X,Sloppy J D,et al.Vertically aligned WO3 nanowire ar-rays grown directly on transparent conducting oxide coated glass:Syn-thesis and photoelectrochemical properties[J].Nano letters,2010,11(1):203-208.
[12] Xi G,Ye J,Ma Q,et al.In situ growth of metal particles on 3D ur-chin-like WO3 nanostructures[J].Journal of the American Chemistry Society,2012,134(15):6508-6511.
[13] Sadek A Z,Zheng H,Breedon M,et al.High-temperature anodized WO3 nanoplatelet films for photosensitive devices[J].Langmuir,2009,25(16):9545-9551.
[14] Shen Y,Yan M Y,Zhao L,et al.Influence of pH on structure and photochromic properties of WO3 nano-powder[J].Journal of Function-al Materials,2009,40(5):732-734.
[15] Breedon M,Spizzirri P,Taylor M,et al.Synthesis of nanostructured tungsten oxide thin films:A simple,controllable,inexpensive,aqueous sol-gel method[J].Crystal Growth and Desisn,2009,10(1),430-439.
[16] Li Z L,Liu F,Xu N S,et al.A study of control growth of three-dimen-sional nanowire networks of tungsten oxides:From aligned nanowires through hybrid nanostructures to 3D networks[J].Journal of Crystal.Growth,2010,312(4):520-526.
[17] Kalanur S S,Hwang Y J,Chae S Y,et al.Facile growth of aligned WO3 nanorods on FTO substrate for enhanced photoanodic water oxida-tion activity[J].Journal of Materials Chemistry A,2013,1(10):3479-3488.
[18] Ding D,Shen Y,Ouyang Y,et al.Hydrothermal deposition and photo-chromic performances of three kinds of hierarchical structure arrays of WO3 thin films[J].Thin Solid Films,2012,520(24):7164-7168.
[19] Talebian N,Nilforoushan M R,Maleki N.Ultraviolet to visible-light range photocatalytic activity of ZnO films prepared using sol-gel meth-od:The influence of solvent[J].Thin Solid Films,2013,527:50-58.
[20] Pan W,Tian R,Jin H,et al.Structure,optical,and catalytic proper-ties of novel hexagonal metastable h-MoO3 nano-and microrods syn-thesized with modified liquid-phase processes[J].Chemistry of Materi-als,2010,22(22):6202-6208.
