Naizhi Wang

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Fluorescent carbon dots (CDs) were solvothermaly synthesized in water-glycol medium by using glucose as carbon source and then modified with polyethyleneimine (PEI) for the first time to improve fluorescence quality. The as-prepared CDs were monodispersed sphere particles with a diameter of about 7.5 nm, emitting strong fluorescence which is excitation(More)
A study on hydrothermal synthesis of CdTe quantum dots, highly luminescent nanocrystals at a relatively lower temperature, via changing the concentration of the CdTe precursors, is described. The full width at half maximum ranged from 40 to 80nm and quantum yield (QY) was detected to be 27.4% at room temperature. The as-prepared CdTe QDs were labeled with(More)
In this paper, we propose a method to use 1-D dielectric slabs, instead of metallic Frequency Selective Surfaces (FSSs), to produce Partially Reflective Surfaces (PRSs) with positive reflection phase gradients. The structure is realized by a single kind of dielectric substrate. It is modeled as cascaded transmission lines and then analyzed by virtue of the(More)
An L-Sloted Dual-Band microstrip antenna for WiMAX 3.5G/5.8G applications is demonstrated in this paper. A prototype has been designed, fabricated and tested. The measured results show that the operating frequencies of the antenna are 3.45–3.65GHz and 5.6–5.9GHz for an S-Parameter of better than −10 dB. Satisfactory radiation patterns(More)
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