Durable Perovskite UV Sensor Based on Engineered Size-Tunable Polydimethylsiloxane Microparticles Using a Facile Capillary Microfluidic Device from a High-Viscosity Precursor

Abstract

In this work, size-tunable polydimethylsiloxane (PDMS) microparticles are fabricated from a high-viscosity oil phase using a facile coflowing capillary microfluidic device and optimized aqueous phase composition. The dispersity of the microparticle size is tuned by engineering of the viscosity of the continuous phase and flow rate ratio that leads us to achieve monodisperse microparticles. Regarding the high potential of the PDMS microparticles for optical applications, efficient environmentally durable perovskite-based UV sensors are fabricated employing the designed size-tunable microparticles. Surprisingly, the UV sensors comprising CH 3 NH 3 PbBr 3 perovskite quantum dots as UV-sensitive nanocrystals embedded in transparent PDMS microparticles are water resistant because of the high hydrophobicity of PDMS. Remarkably, the UV sensors show a photoluminescence quantum yield as high as 75% that can be employed effortlessly as reusable leak detectors in different fluidic working systems.

Wastewater Treatment Using High-Performance In Situ Formed Double-Heterojunction Janus Photocatalyst Microparticles Shaped via a Microfluidic Device

“…As a modern and exciting technology, microfluidics has been used to create the carefully controlled emulsions, resulting in extremely monodisperse emulsions having specific structural and morphological characteristics . Among different microfluidic devices, the glass capillary devices offer high-potential advantages in terms of low fabrication costs, stability toward organic solvents, and no leaking fluids . Lian created and modified needle-based microfluidic systems to fabricate oil-in-water single emulsion templates and synthesize various PDMS microparticles …”

“…31 Among different microfluidic devices, the glass capillary devices offer high-potential advantages in terms of low fabrication costs, stability toward organic solvents, and no leaking fluids. 31 Lian created and modified needle-based microfluidic systems to fabricate oil-in-water single emulsion templates and synthesize various PDMS microparticles. 32 In this work, heterogeneous photocatalysis systems are fabricated for removing organic dye and TC as a pharmaceutical substance from wastewater.…”

Continuous Preparation of Homogeneous Crosslinked PDMS Microgel Particles through Photoinduced Reversible Addition-Fragmentation Chain Transfer Polymerization

“…Polydimethylsiloxane (PDMS) is known to be one of the most widely used silicone polymers owing to the characteristics of biocompatibility, high elasticity, air permeability, transparency, high hydrophobicity, and so on. − In addition to bulk products or films, PDMS can also be prepared to be gel particles which provide broad application prospects in the fields of sensors, polymer toughening agents, bioengineering, and drug delivery. − The normally used methods for the preparation of PDMS microgel particles are emulsion polymerization or (mini)­emulsion polymerization . Through radical polymerization in the (mini)­emulsion droplets, PDMS networks could be built with PDMS macromonomers which were functionalized with groups such as acrylate units or hydroxyl groups. − …”

Internal Referencing Photoluminescence Probes for Simultaneous Sensing of O2 Gas and Temperature Based on Mn:MAPb(Br/Cl)3 Perovskite

“…Amjadi et al embedded PNCs in polydimethylsiloxane (PDMS) as a hydrophobic polymer which efficiently protected them against moisture. [ 11 ] Casanova‐Cháfer et al developed a gas sensor based on MAPbBr 3 PNCs that was protected against moisture using a thin hydrophobic layer of graphene. [ 12 ]…”

“…Amjadi et al embedded PNCs in polydimethylsiloxane (PDMS) as a hydrophobic polymer which efficiently protected them against moisture. [11] Casanova-Cháfer et al developed a gas sensor based on MAPbBr 3 PNCs that was protected against moisture using a thin hydrophobic layer of graphene. [12] The dual-emission PL spectrum derived from single-exciton band-edge absorption implies the presence of intraparticle host doping energy transfer (HDET) in PNCs.…”