A dual-emissive Eu-TCPE-based test-strip sensor was developed for the ultrasensitive ratiometric and visual detection of tetracycline in real samples.

Hydrogen-bond driven self-assembly of carbon dot-based luminescent materials has been widely studied in the fields of sensor and optoelectronic devices. However, the uniformly confinement of carbon-dots (CDs) into crystalline porous...

A radial mesoporous silica (mSiO2) supported Eu3+‐functionalized carbon dots (CDs) nanocomposite (mSiO2‐CDs‐Eu) was successfully prepared using citric acid as CD precursors, showing specific ratiometric tetracycline (TC) fluorescence sensing behavior. The blue fluorescence of CDs is quenched by the internal filtering effect with TC, and the red fluorescence intensity of Eu3+ ions is improved on account of an antenna effect. The self‐calibrated ratiometric fluorescence sensing of TC by mSiO2‐CDs‐Eu showed a minimum detection limit of 30 nM. In addition, a mSiO2‐CDs‐Eu hybridized polyvinylidene fluoride (PVDF) film was developed for optical temperature sensing with a high‐temperature sensitivity of 1.69% °C−1 in the physiological temperature range of 25–45°C and a temperature resolution greater than 0.04°C. This work demonstrates a feasible way in fabricating dual‐functional mSiO2‐CDs‐Eu nanocomposite with optical ratiometric sensing properties toward both TC and temperature changes, opening its promising applicability for food security and temperature monitoring.

Exploration of credible non-enzymatic glucose sensors with high selectivity and sensitivity is of great significance for early clinical monitoring glucose concentration and preventing the threat of diabetes to human health....

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