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Significant enhancement of UV emission in ZnO nanorods subject to Ga＋ ion beam irradiation

Nano research 2015年第6期8卷 1857-1864页

作者： Boluo Yadian Rui Chen Hai Liu Handong Sun Qing Liu Chee Lip Gan Zhou Kun Chunwang Zhao Bin Zhu Yizhong Huang School of Materials Science and Engineering Nanyang Technological University SO Nanyang Avenue 639798 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore College of Art and Sciences Shanghai Maritime University Shanghai 201306 China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Faculty of Physics and Electronic Science Hubei University Wuhan Hubei 430062 China

Applications of ZnO nanomaterials in optoelectronics are still limited due to their insufficient photoluminescence efficiency. In order to optimize the photoluminescence properties of ZnO nanorods, the UV emission of vertically aligned ZnO nanorods grown on a Si substrate, in correlation with Ga＋ ion irradiation at different ion energies （0.5 keV-16 keV）, was investigated in the present study. We found that the UV intensity increased rapidly with increasing Ga＋ ion energy, up to its maximum around 2 keV, at which point the intensity was approximately 50 times higher than that produced by as-grown ZnO nanorods. The gentle bombardment of low-energy Ga＋ ions removes defects from ZnO nanorod surfaces. The Ga＋ ions, on the other hand, implant into the nanorods, resulting in compressive strain. It is believed that the perfect arrangement of the crystal lattice upon removal of surface defects and the introduction of compressive strain are two factors that contribute to the significant enhancement of UV light generation.

关键词： ZnO nanorods photoluminescenceenhancement UV emission Ga+ ion beam

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Dynamic photonic barcodes for molecular detection based on cavity-enhanced energy transfer

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Advanced Photonics 2020年第6期2卷 69-77页

作者： Yunke Zhou Zhiyi Yuan Xuerui Gong Muhammad D.Birowosuto Cuong Dang Yu-Cheng Chen Nanyang Technological University School of Electrical and Electronic EngineeringSingapore CINTRA UMI CNRS/NTU/THALES Singapore Nanyang Technological University School of Chemical and Biomedical EngineeringSingapore

Optical barcodes have demonstrated a great potential in multiplexed bioassays and cell tracking for their distinctive spectral *** vast majority of optical barcodes were designed to identify a specific target by fluorescence emission spectra,without being able to characterize dynamic changes in response to analytes through *** overcome these limitations,the concept of the bioresponsive dynamic photonic barcode was proposed by exploiting interfacial energy transfer between a microdroplet cavity and binding ***-gallery modes resulting from cavity-enhanced energy transfer were therefore converted into photonic barcodes to identify binding activities,in which more than trillions of distinctive barcodes could be generated by a single *** spectral barcoding was achieved by a significant improvement in terms of signal-to-noise ratio upon binding to target *** studies and experiments were conducted to elucidate the effect of different cavity sizes and analyte *** fluorescence lifetime was implemented to investigate the role of radiative and non-radiative energy ***,microdroplet photonic barcodes were employed in biodetection to exhibit great potential in fulfilling biomedical applications.

关键词： whispering-gallery modes optical barcodes fluorescence resonance energy transfer molecular sensing biointerface cavity-enhancement

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