Abstract
Adual supersaturation recrystallization method was employedto synthesize water-stable, highly sensitive cesium-leadhalide perovskite nanocrystals(CsPbBr3 PNCs). The PNCs exhibited excellent water stability, a significant photoluminescence quantum efficiency of 83.03%, along with a narrow full width at half maximum (FWHM) of 20nm. Following iodide ion treatment, the fluorescence emission peak of CsPbBr3 PNCs can be tuned from 520 to 681nm, causing a color transition from green to red. Within the 0-300μM range, the red shift showed a linear correlation with I- concentration, achieving a detection limit as low as 0.40μM. It is worth noting that excessive iodide ions could have allowed PNCs to exhibit dual emission with maximum wavelengths of 520 and 681nm. A ratiometric perovskite nanoprobe was constructed with the green emission peak as an internal standard and the red emission peak as the response signal. The probe demonstrated a strong linear correlation with tetracycline concentrations ranging from 0 to 8μM, with a detection limit of 88.60nM (S/N = 3). This research offers valuable insights into the design and development of ratiometric perovskite sensors capable of detecting in aqueous solutions, while also emphasizing the importance of rapidly establishing hydrogen-bonding networks when analyzing such detection systems.
Published Version
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