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Using an electronic double layer transistor we have systematically studied the superconductor to insulator transition in La2CuO 4+δ thin films growth by ozone assisted molecular beam epitaxy. We have confirmed the high crystalline quality of the cuprate films and have demonstrated the suitability of the electronic double layer technique to continuously vary the charge density in a system that is otherwise characterized by the presence of miscibility gaps. The transport and magneto-transport results highlight the role of electron-electron interactions in the mechanism of the transition due to the proximity of the Mott insulating state.

A new luminescent Zn(II)-based metal-organic framework (MOF), [Zn(TPOM)(NDC)]·3.5HO (Zn-MOF; TPOM = tetrakis(4-pyridyloxymethylene)methane and Hndc = 2,6-naphthalenedicarboxylic acid), was successfully synthesized by a hydrothermal reaction. The MOF exhibits excellent luminescence emission, and it can detect Fe(III) and Cr(VI) ions with high selectivity, well antiinterference performance, and short response time. In addition, Zn-MOF was selected as a parent coordination compound to encapsulate Eu cations to obtain a Eu-incorporated sample (Eu@Zn-MOF). Subsequently, we explored the potential application of Eu@Zn-MOF as a probe for the selective sensing of Fe(III) and Cr(VI) ions, and it revealed that we could differentiate Fe(III) and Cr(VI) ions by the combination Zn-MOF and Eu@Zn-MOF. More importantly, it represents the first example of MOF-based luminescent sensors which can detect and differentiate Fe(III) and Cr(VI) ions selectively. And the possible sensing mechanism was discussed in detail.

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