The duplex trapping behavior between a DPP-based POF and polysulfides is propitious for maintaining active substances and restricting the shuttle effect, realizing Li–S batteries with high rate, high sulfur content and high capacity retention.

Fluorescence-based detection is one of the most efficient and cost-effective methods for detecting hazardous, aqueous Hg 2+ . We designed a fluorescent porous organic polymer (TPA-POP-TSC), with a "fluorophore" backbone and a thiosemicarbazide "receptor" for Hg 2+ -targeted sensing. Nanometer-sized TPA-POP-TSC spheres (nanoPOP) were synthesized under mini-emulsion conditions and showed excellent solution processability and dispersity in aqueous solution. The nanoPOP sensor exhibits exceptional sensitivity (K sv = 1.01 × 10 6 M −1 ) and outstanding selectivity for Hg 2+ over other ions with rapid response and full recyclability. Furthermore, the nanoPOP material can be easily coated onto a paper substrate to afford naked eye-based Hg 2+detecting test strips that are convenient, inexpensive, fast, highly sensitive, and reusable. Our design takes advantage of the efficient and selective capture of Hg 2+ by thiosemicarbazides (binding energy = −29.84 kJ mol −1 ), which facilitates electron transfer from fluorophore to bound receptor, quenching the sensor's fluorescence.

Most organic dyes dissipate their excitation energy in the aggregated state because of "aggregation caused quenching" effect, deteriorating their application in optoelectronic devices. To prevent "aggregation caused quenching" effect, we incorporate a dye-based fluorophore into a porous organic polymer skeleton because porosity would breed the spatial isolation of fluorophores to maintain its emission. Tuning the fraction of fluorophores in the skeleton of FL-SNW-DPPs would range the emission color covering from red to blue in both solid-state and suspension. More importantly, the combination of fluorescence and porosity of FL-SNW-DPPs would provide more space to transduce the molecular interaction between adsorbed analytes and fluorophores to the detectable changes in light emission, leading to the fluorescence-off or fluorescence-on detection of electron-deficient or electron-rich analytes.

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