One-Pot Synthesis of Highly Stable CsPbBr<sub>3</sub>@SiO<sub>2</sub> Core–Shell Nanoparticles

Zhong, Qixuan; Cao, Muhan; Hu, Huicheng; Yang, Di; Chen, Min; Li, Pengli; Wu, Linzhong; Zhang, Qiao

doi:10.1021/acsnano.8b04209

Cited by 523 publications

(436 citation statements)

References 70 publications

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“…Its PL intensity remained nearly constant after dipping the composite into the water/IPA solution. Such observations are in good agreement with a few recent publications that show embedding perovskite nanocrystals in a polymer or ceramic matrix to improve the stability of the perovskite in water . Moreover, the dense sample also had a negligible PL intensity change after immersion in the TNT‐water/IPA solution (Figure f).…”

supporting

confidence: 91%

Porous Halide Perovskite–Polymer Nanocomposites for Explosive Detection with a High Sensitivity

Shan

Zhang

Zhou

et al. 2018

Adv Materials Inter

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a field-based environment, is critical for homeland security and public safety.In practice, trained canines and spectroscopic techniques have both been used to detect explosive chemicals. However, trained canines are expensive. They can also be fatigued and are not suitable for continuous monitoring. [15] Ion mobility spectrometry has been one of the most used commercial spectroscopic tools to detect explosive chemi cals. [16] It has a high sensitivity ranging from picograms to nanograms. [16] However, due to its high cost and large size, it is usually used in a stationary setting such as a security checkpoint. Alternatively, fluorescence-based explosive detection can be applied in-field at a relatively low cost. The detection mechanism is based on fluorescence quenching of the fluorophores after absorbing particles and/or vapors of the explosives. [17] Trace amount detection has been realized in literature using conjugated polymers, [18,19] metal-organic frameworks (MOFs), [20] and luminescent quantum dots (QDs), [21] etc. as the fluorophores. Very recently, halide perovskites have also been studied as new alternative fluorophores. For instance, Aamir et al. prepared cesium lead bromoiodide (CsPbBr 2 I) microcrystals in dimethylformamide (DMF) and demonstrated their use for detecting nitrophenol explosives. [12] Muthu et al. used methylammonium lead tribromide (MAPbBr 3 ) nanoparticles in toluene and reported their photoluminescence (PL) quenching characteristics by adding 2,4,6-trinitrophenol. [11] Halide perovskites have the advantage of an easier synthesis process at room temperature and exhibit more intense fluorescence due to their ultrahigh PL quantum yield compared to conjugated polymers, MOFs, and luminescent QDs fluorophores. Furthermore, previous reports used suspensions of halide perovskite particles in a solvent. In a humid environment, these perovskites will inevitably undergo composition degradation and fluorescence decrease, thus leading to false responses in a field detection. [22] In this work, we report porous nanocomposites consisting of MAPbBr 3 nanocrystals embedded in a poly(vinylidene fluoride) (PVDF) polymer matrix. The composites have a pore size of 2-10 µm and a wall thickness of hundreds of nanometers. The high porosity facilitates the diffusion process of explosive chemicals to the fluorescent perovskite nanocrystals, and the hydrophobic PVDF polymer matrix inhibits the penetration of water and alcohol molecules into the composites. As a result, the nanocomposites show no fluorescence degradation upon A porous halide perovskite-polymer nanocomposite is developed using a freeze-drying process. Such a composite shows strong fluorescence quenching after exposure to explosive nitroaromatics, nitroamines, and nitrate esters with a sensitivity of a few nanograms. In addition, this composite is robust against moisture and solvents, showing negligible change in fluorescence intensities after submersion in water, alcohol, and acid, base, and salt solutions. Transient absorption spectroscopy st...

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supporting

confidence: 91%

Porous Halide Perovskite–Polymer Nanocomposites for Explosive Detection with a High Sensitivity

Shan

Zhang

Zhou

et al. 2018

Adv Materials Inter

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“…or polymers is another effective strategy to improve stability. [33][34][35][36][37][38][39] Incorporating CsPbX3 NCs into various hydrophobic matrices, such as polystyrene (PS), 18,37,40 PVP/silicone resin, 41 POSS-based copolymers 15 with chemically addressable ligands, 15,25 or the diblock copolymer PS-b-PVP 42 can preserve well-defined morphology and bright fluorescence, while dramatically enhancing the NCs' stability towards UV light and water.…”

Section: Introductionmentioning

confidence: 99%

Highly Stable Luminous “Snakes” from CsPbX₃ Perovskite Nanocrystals Anchored on Amine-Coated Silica Nanowires

Pan

Jurow

et al. 2018

ACS Appl. Nano Mater.

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Despite the exceptional optoelectronic characteristics of perovskite nanocrystals (NCs), the materials' potential applications are primarily limited by their instability arising from the ionic nature of the CsPbX3 (X=Cl, Br and I) lattice, low formation energy and spontaneous ion exchange. Herein, we introduce a facile and effective in-situ growing strategy to prepare extremely stable composites (abbr. CsPbX3@CA-SiO2) by anchoring CsPbX3 NCs onto silica nanowires (NWs), which effectively depresses the optical degradation of their photoluminescence (PL) and enhances stability. The serpentine silica NWs, with tunable lengths of up to 8 μm, are prepared by anisotropic sol-gel growth of hydrolyzed tetraethylorthosilicate (TEOS) with 3aminopropyltriethoxysilane (APTES) and trimethoxy(octadecyl)silane (TMODS) in a water/oil emulsion. The free amino groups are employed as surface ligands for growing perovskite NCs, yielding distributed monodisperse NCs (~8 nm) around the NW matrix. The emission wavelength is tunable by simple variation of the halide compositions (CsPbX3, X=Cl, Br or I) and the composites demonstrate a high photoluminescence quantum yield (PLQY 32-69%). Additionally, we have demonstrated the composites CsPbX3@CA-SiO2 can be self-woven to form a porous 3D hierarchical NWs membrane, giving rise to a superhydrophobic surface with hierarchical micro/nano structural features. Most importantly, the resulting composites exhibit remarkable chemical stability towards water, and much enhanced photostability and thermal stability. This work presents an effective strategy to incorporate perovskite NCs onto functional matrices as multifunctional stable light sources.

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“…[4] Particularly, PQDs suffer from low chemical and optical stabilities, resulting in their fast degradation under exposure to moisture, heat, and light irradiance. [13,14] Current research efforts therefore aim at enhancing the stability of PQDs by covering them in inorganic materials, including CdS, [15] zeolite, [16,17] glass, [18,19] CaF 2 , [20] Al 2 O 3 , [21][22][23] SiO 2 , [24][25][26][27][28][29] and TiO 2 . [13,14] Current research efforts therefore aim at enhancing the stability of PQDs by covering them in inorganic materials, including CdS, [15] zeolite, [16,17] glass, [18,19] CaF 2 , [20] Al 2 O 3 , [21][22][23] SiO 2 , [24][25][26][27][28][29] and TiO 2 .…”

mentioning

confidence: 99%

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

Song

et al. 2020

Adv Materials Technologies

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hence have drawn a lot of attention as down-conversion materials for white lightemitting diodes (WLEDs). [7][8][9][10] For practical applications, the cost-effectiveness, the optical performance, and the stability of PQDs should be further improved. [4] Particularly, PQDs suffer from low chemical and optical stabilities, resulting in their fast degradation under exposure to moisture, heat, and light irradiance. [11,12] Accordingly, PQDs exhibit much lower stability than conventional rare-earth-based phosphor materials. [13,14] Current research efforts therefore aim at enhancing the stability of PQDs by covering them in inorganic materials, including CdS, [15] zeolite, [16,17] glass, [18,19] CaF 2 , [20] Al 2 O 3 , [21][22][23] SiO 2 , [24][25][26][27][28][29] and TiO 2 . [30] Generally, the protective shells of PQDs are prepared using these inorganic materials by in situ synthesis. While protected PQDs with high chemical, thermal, and irradiation stabilities have been obtained, [28] the water stability of PQDs prepared with these inorganic shells still indicate a lot of room for improvement. For instance, the PL intensity of CaF 2 shell-integrated green PQDs reduces to <50% after a water-resistance test of ≈40 h. [20] Consequently, and until now, PQDs with high water stability are achieved by embedding them in enclosed organic polymer and glass matrices. [18,19,[31][32][33][34][35][36][37][38][39] The hydrophobic surface and dense polymer chains of the matrix can effectively protect the PQDs from the external environment, considerably enhancing their At present, most of lead halide perovskite quantum dots (PQDs) embedded in an enclosed organic polymer or glass matrix can achieve high water stability, yet this limits their subsequent integration with light-emitting diodes (LEDs) and other functional materials. Herein, a postadsorption process using superhydrophobic aerogel inorganic matrix (S-AIM) with open structures is presented to enhance water stability of PQDs and compose newfunctions to them such as magnetism. The CsPbBr 3 PQDs integrated with the S-AIM (AeroPQDs) exhibit a high relative photoluminescence quantum yield (PLQY, 75.6%) of 90.9% compared to pristine PQDs (PLQY, 83.2%). They preserve their initial PL intensity after 11 days of soaking in water and achieve a high relative PLQY stability (50.5%) after soaking for 3.5 months. The hydrophobic (rough) surface of the matrix, its pores with a well-matched mean diameter that promotes the homogeneous integration of PQDs and hinders the penetration of water as well as the oleophylic functional groups covering the surface of these pores are the three factors responsible for the high water stability. Finally, AeroPQDs are easily integrated with other functional nanomaterials, such as Fe 3 O 4 nanoparticles for magnetic manipulation, due to their open structure.

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One-Pot Synthesis of Highly Stable CsPbBr₃@SiO₂ Core–Shell Nanoparticles

Cited by 523 publications

References 70 publications

Porous Halide Perovskite–Polymer Nanocomposites for Explosive Detection with a High Sensitivity

Porous Halide Perovskite–Polymer Nanocomposites for Explosive Detection with a High Sensitivity

Highly Stable Luminous “Snakes” from CsPbX₃ Perovskite Nanocrystals Anchored on Amine-Coated Silica Nanowires

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

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One-Pot Synthesis of Highly Stable CsPbBr3@SiO2 Core–Shell Nanoparticles

Cited by 523 publications

References 70 publications

Porous Halide Perovskite–Polymer Nanocomposites for Explosive Detection with a High Sensitivity

Porous Halide Perovskite–Polymer Nanocomposites for Explosive Detection with a High Sensitivity

Highly Stable Luminous “Snakes” from CsPbX3 Perovskite Nanocrystals Anchored on Amine-Coated Silica Nanowires

Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes

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Product

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One-Pot Synthesis of Highly Stable CsPbBr₃@SiO₂ Core–Shell Nanoparticles

Highly Stable Luminous “Snakes” from CsPbX₃ Perovskite Nanocrystals Anchored on Amine-Coated Silica Nanowires