Bismuth-based lead-free perovskite film for highly sensitive detection of ammonia gas

Deciphering the Role of Water in Promoting the Optoelectronic Performance of Surface-Engineered Lead Halide Perovskite Nanocrystals

“…XRD refinement reveals the presence of a mixture of two cubic phases, the major phase corresponding to the typical cubic structure of FAPbBr 3 [ Pm 3̅ m , a = 6.0179 (2) Å], and a second phase with sharp peaks (marked with *) belonging to the cubic ammonium bromide (NH 4 Br) structure [ Pm 3̅ m , a = 4.0620 (1) Å] (Figure S1). (ii) The XRD patterns of the post-treated FAPbBr 3 NCs exhibit low-angle diffraction features below 2θ = 15°, suggesting the presence of a low-dimensional structure, which is potentially further stabilized by the presence of NH 4 Br. It is important to note that post-treatment is generally a surface modifying (healing in this case) approach and is not expected to impact the bulk of the crystal.…”

A review on the sensing mechanisms and recent developments on metal halide-based perovskite gas sensors

“…At room temperature, the lead-free (phenethylammonium) 3 Bi 2 Br 9 (PEA–Bi–Br)-based sensor for NH 3 gas showed a high gas response ( R 0 / R g = 1.76, at 30 ppm NH 3 ), short response/recovery time (39/130 s), low detection limit (0.2 ppm), and good reversibility. 201 Both reductive and oxidative gases can lead to a decrease in the resistance of the PEA–Bi–Br material due to its ambipolar nature. Thus, its increase in charge carrier density depends on the adsorption of electron-withdrawing or electron-donating molecules.…”

“…158 The performance of gas sensors based on different metal halide perovskites is summarized in Table 1. 14,33,36,37,142,143,149,151,158–208…”

Selective fluorescence sensor for Fe3+ based on in situ synthesis of CsSnCl3 perovskite quantum dots with bone gelatin

“…However, the hazardous Pb element in Pb-based QDs can affect the environment and people, which restricts their practical usage in the fluorescence sensing industry. 8 Pb-free QDs have been used in photocatalysis, anti-bacterial, 9 and anti-mildew 10 applications, among others. They also have a lot of promise for use in fluorescence sensing.…”

“…Perovskite QDs have been widely studied in the biological field because of their high fluorescence efficiency, 5 tunable bandgap, 6 and narrow peak width 7 ; perovskite QDs are expected to be applied in the field of fluorescence sensing. However, the hazardous Pb element in Pb‐based QDs can affect the environment and people, which restricts their practical usage in the fluorescence sensing industry 8 . Pb‐free QDs have been used in photocatalysis, anti‐bacterial, 9 and anti‐mildew 10 applications, among others.…”