Quantum dots are nano-scale inorganic semiconductor materials typically 1-10 nm in size, which exhibit interesting optical, electronic, and catalytic properties. Their electroluminescent and photoluminescent properties find applications in optoelectronic devices, fluorescent labelling in biotechnology and medical imaging. They may be less toxic than conventional fluorophores, are relatively resistant to photobleaching and possess a longer lifetime/stability. We present the development and characterisation of new hybrid materials comprising quantum dots and wool and paper fibres that exhibit tuneable optical fluorescence and electronic properties, for potential use in fabrics and packaging and labelling papers. ZnS, ZnO and Cu2O have been selected as they can be readily synthesised and fluorescence in the visible and UV regions. Wet chemical methods have been used to synthesise these quantum dots. The composition, structure, size and photoluminescent properties of the quantum dots can be controlled by changing the reaction conditions. ZnS quantum dots doped with Mn2+ exhibit orange fluorescence. Cu-doped ZnS quantum dots show green fluorescence. ZnO – 8-Hydroxyquinoline quantum dots show bright light green fluorescence. The quantum dots have been attached to wool and paper fibres either directly or by using of linkers to provide new quantum dot – fibre composites. The properties have been characterised.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 21, 2010
Pages: 760 - 763
Industry sector: Advanced Materials & Manufacturing
Topics: Advanced Materials for Engineering Applications, Composite Materials