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论文类型：期刊论文

发表时间：2018-06-05

发表刊物：ADVANCED OPTICAL MATERIALS

收录刊物：SCIE

卷号：6

期号：11

ISSN号：2195-1071

关键字：Cr(VI) detection; fluorescence enhancement; heterostructure photonic crystal; super-wide stopband; universal substrate

摘要：Universal fluorescence (FL) enhancement is achieved based on a multiple heterostructure photonic crystal (MHPC) with a super-wide stopband. This MHPC film is fabricated by layer-by-layer deposition of annealed colloidal crystal monolayers with gradient sizes, and it displays a broadened stopband (from 280 to 650 nm) that can overlap with the excitation wavelength (E) and the emission wavelength (F) of most commonly used fluorescent media. More than 100-fold FL enhancement of [Ru(dpp)(3)Cl-2], rhodamine 6G (Rh6G), and rhodamine B (RhB) on the MHPC is observed compared to that on a glass substrate. This super-wide stopband MHPC may find significant applications for augmenting FL intensity in chemical and biochemical sensing, imaging, disease diagnosis, and environmental monitoring. The function of MHPC/rhodium B hydrazide composites is further demonstrated in the semiquantitative detection of Cr(VI), and the limit of detection of Cr(VI) is effectively improved to 0.2 ppb.