A europium­(III) metal–organic framework (MOF), namely, {[[(CH3)2NH2]3Eu2(DTTP-2OH)2(HCOO)­(H2O)]·4H2O} n (Eu-MOF, H4DTTP-2OH = 2′,5′-dihydroxy-[1,1′:4′,1″-terphenyl]-3,3″,5,5″-tetracarboxylic acid) has been assembled through solvothermal method. The Eu-MOF is a three-dimensional (3D) (4,4,8)-connected topological framework with binuclear Eu­(III) clusters as secondary building units, in which a richly ordered hydrogen bonding network formed among the free H2O molecules, dimethylamine cations, and phenolic hydroxyl groups provides a potential pathway for proton conduction. The proton conductivity reaches the category of superionic conductors (σ > 10–4 S cm–1) at room temperature with a maximum conductivity of 1.91 × 10–3 S cm–1 at 60 °C and 98% RH. Moreover, it also can be used as a fluorescence sensor in aqueous solution with detection limits of 0.14 μM for tetracycline, 0.13 μM for oxytetracycline and 0.11 μM for doxycycline. These results pave new methods for constructing MOFs with high proton conductivity and responsive fluorescence.

Cold gas dynamic spraying is a promising technology and successfully applied to a wide range of materials. In this paper, orthogonal experimental method was introduced to seek out the optimal parameters for cold spraying copper coating. According to the results, standoff distance influenced the coating’s quality the most significantly as well as the carrier gas temperature had a remarkable impact either, but the carrier gas pressure and controlling voltage which influenced feeding speed subsequently had little influence on the coating’s quality. The coating’s porosity, bonding strength, microhardness and the coating’s conductivity were determined respectively. More over, optical and scanning electron microscopies were introduced to study the coating’s surface morphology and its internal structure. Also the effect of subsequent heat treatment on coating’s microhardness was investigated.