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UV-Blocking Property of Dumbbell-Shaped ZnO Crystallites on Cotton Fabrics

UV-Blocking Property of Dumbbell-Shaped ZnO Crystallites on Cotton

Fabrics

R.H.Wang,*J.H.Xin,*and X.M.Tao

Nanotechnology Center for Functional and Intelligent Textiles and Apparel,Institute of Textiles&

Clothing,The Hong Kong Polytechnic Uni V ersity,Hung Hom,Kowloon,Hong Kong

Received March2,2005

A facile process to prepare uniform dumbbell-shaped ZnO crystallites was presented.The evidence in this Article

discovered a unique morphological effect on the UV-blocking property.The as-prepared ZnO crystallites were characterized by XRD,HRTEM,FESEM,UV-blocking,and Raman scattering spectra.Our tentative investigation created a breakthrough to both the ultrahigh“Ultraviolet protection factor”(UPF)and the overall-range of complete UV-radiation blocking.Therefore,the as-prepared structural material demonstrated a significant advance in protective functional treatment and provided a potential commercialization.

Introduction

The synthesis of one-dimensional(1-D)nano-or micro-structured ZnO semiconductor materials ranging from wires,1 belts,2branches,3needles,4towers,5tubes,6columns,7tetra-pods,8nails,9helices,10combs,11and tadpoles12to dumbbells13 has attracted considerable research activity because of their great potential for fundamental studies of the roles of dimensionality and size in their physical properties as well as for applications in optoelectronic devices and functional materials.Hydrothermal methods14are recognized as ex-cellent procedures for the preparation of1-D ZnO nano-crystallites,as the resulting particles have narrow size distribution,good crystallization,and high-quality growth orientation.For application at ambient pressure,neverthe-less,hydrothermal reaction is not suitable for larger scale and industrial preparation because of pressure limitation. To recap this,we previously developed an ambient-pressure and low-temperature zerogel-seeded opening crystallization (APLTZOC)approach.13a It provided a rational route to scale-up the preparation of1-D ZnO nano-and microstructured materials,as part of a program to develop routes to nano-and microscale ZnO materials on cotton fabrics with better UV-blocking property.

Designing and modifying fabrics in such a way that they offer high protection against UV radiation(UV-R,both UVA and UVB,falls into the regions of315-400and280-315 nm,respectively,of the solar spectra)is a relatively new application.15d To indicate the protection from UV-R,the term“sun protection factors”(SPFs)is widely used;it is usually associated with cosmetic skin protection products and was first established in Australia and New Zealand.The category can now be applied to textiles and identified on

*To whom correspondence should be addressed.Tel:+852-2766-6474. Fax:+852-2773-1432.E-mail:tcroger.rhwang@polyu.edu.hk(R.H.W.); tcxinjh@inet.polyu.edu.hk(J.H.X.).

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UV-Blocking Property of Dumbbell-Shaped ZnO Crystallites on Cotton Fabrics

3926Inorganic Chemistry,Vol.44,No.11,200510.1021/ic0503176CCC:$30.25©2005American Chemical Society

Published on Web05/03/2005