MDPI - Publisher of Open Access Journals

25 pages, 5995 KiB

Open AccessReview

Novel Lead Halide Perovskite and Copper Iodide Materials for Fluorescence Sensing of Oxygen

by Jingwen Jin, Yaning Huang, Chen Zhang, Li Zhang, Shaoxing Jiang and Xi Chen

Biosensors 2025, 15(3), 132; https://doi.org/10.3390/bios15030132 - 21 Feb 2025

Cited by 1 | Viewed by 1333

The most commonly used optical oxygen sensing materials are phosphorescent molecules and functionalized nanocrystals. Many exploration studies on oxygen sensing have been carried out using the fluorescence or phosphorescence of semiconductor nanomaterials. Lead halide perovskite nanocrystals, a new type of ionic semiconductor, have excellent optical properties, making them suitable for use in optoelectronic devices. They also show promising applications in analytical sensing and biological imaging, especially manganese-doped perovskite nanocrystals for optical oxygen sensing. As a class of materials with diverse sources, copper iodide cluster semiconductors have rich structural and excellent luminescent properties, and have attracted attention in recent years. These materials have adjustable optical properties and sensitive stimulus response properties, showing great potential for optical sensing applications. This review paper provides a brief introduction to traditional oxygen sensing using organic molecules and introduces research on oxygen sensing using novel luminescent semiconductor materials, perovskite metal halides and copper iodide hybrid materials in recent years. It focuses on the mechanism and application of these materials for oxygen sensing and evaluates the future development direction of these materials for oxygen sensing. Full article

(This article belongs to the Special Issue State-of-the-Art Biosensors in China (2nd Edition))

► Show Figures

Figure 1

8 pages, 795 KiB

Open AccessCommunication

Luminescent Properties and Thermal Stability of [PPh₄][Cu₃I₄] with a Unique Helical Structure

by Luyi Chen, Andrey A. Petrov, Mingming Li, Sergey A. Fateev and Alexey B. Tarasov

Molecules 2025, 30(3), 543; https://doi.org/10.3390/molecules30030543 - 25 Jan 2025

Cited by 2 | Viewed by 850

Abstract

Hybrid halocuprates (I) with organic cations show great potential for optoelectronic applications due to their tunable luminescence and high thermal stability. In this study, the iodocuprate (I) [PPh₄][Cu₃I₄], featuring unique helical chains of face-sharing tetrahedra, was synthesized and characterized. This compound exhibits a bandgap of 3.1 eV and orange luminescence at low temperature, attributed to self-trapped exciton emission. [PPh₄][Cu₃I₄] demonstrates exceptional thermal stability among hybrid halocuprates with decomposition above 380 °C, forming a stable melt at ~255 °C without Cu⁺ oxidation in ambient atmosphere. Full article

(This article belongs to the Section Inorganic Chemistry)

► Show Figures

Figure 1

13 pages, 4234 KiB

Open AccessArticle

Hybrid Chlorides with Methylhydrazinium Cation: [CH₃NH₂NH₂]CdCl₃ and Jahn-Teller Distorted [CH₃NH₂NH₂]CuCl₃

by Jan A. Zienkiewicz, Dorota A. Kowalska, Dawid Drozdowski, Adam Pikul and Maciej Ptak

Molecules 2023, 28(2), 473; https://doi.org/10.3390/molecules28020473 - 4 Jan 2023

Cited by 2 | Viewed by 2194

Abstract

The synthesis, structural, phonon, optical, and magnetic properties of two hybrid organic-inorganic chlorides with monoprotonated methylhydrazinium cations (CH₃NH₂NH₂⁺, MHy⁺), [CH₃NH₂NH₂]CdCl₃ (MHyCdCl₃), and [CH₃NH₂NH₂]CuCl₃ (MHyCuCl₃), are reported. In contrast to previously reported MHyM^IICl₃ (M^II = Mn²⁺, Ni²⁺, and Co²⁺) analogues, neither compound undergoes phase transitions. The MHyCuCl₃ has a crystal structure familiar to previous crystals composed of edge-shared 1D chains of the [CuCl₅N] octahedra. MHyCuCl₃ crystallizes in monoclinic P2₁/c symmetry with MHy⁺ cations directly linked to the Cu²⁺ ions. The MHyCdCl₃ analogue crystallizes in lower triclinic symmetry with zig-zag chains of the edge-shared [CdCl₆] octahedra. The absence of phase transitions is investigated and discussed. It is connected with slightly stronger hydrogen bonding between cations and the copper–chloride chains in MHyCuCl₃ due to the strong Jahn–Teller effect causing the octahedra to elongate, resulting in a better fit of cations in the accessible space between chains. The absence of structural transformation in MHyCdCl₃ is due to intermolecular hydrogen bonding between two neighboring MHy⁺ cations, which has never been reported for MHy⁺-based hybrid halides. Optical investigations revealed that the bandgaps in Cu²⁺ and Cd²⁺ analogues are 2.62 and 5.57 eV, respectively. Magnetic tests indicated that MHyCuCl₃ has smeared antiferromagnetic ordering at 4.8 K. Full article

(This article belongs to the Special Issue Molecular Spectroscopy for Applications in Material Science: Hybrid Organic–Inorganic Perovskites and Related Compounds)

► Show Figures

Graphical abstract

13 pages, 2755 KiB

Open AccessArticle

Explorative Sonophotocatalytic Study of C-H Arylation Reaction of Pyrazoles Utilizing a Novel Sonophotoreactor for Green and Sustainable Organic Synthesis

by Tamer S. Saleh, Abdullah S. Al-Bogami, Katabathini Narasimharao, Ziya A. Khan, Iban Amenabar and Mohamed Mokhtar

Catalysts 2022, 12(8), 868; https://doi.org/10.3390/catal12080868 - 6 Aug 2022

Cited by 5 | Viewed by 2537

Abstract

The development of a mild, general, and green method for the C-H arylation of pyrazoles with relatively unreactive aryl halides is an ongoing challenge in organic synthesis. We describe herein a novel sonophotoreactor based on an ultrasonic cleaning bath and blue LED light (visible light) that induce copper-catalyzed monoarylation for pharmacologically relevant pyrazoles. The hybrid effect of ultrasonic irradiation and blue LED is discussed to interpret the observed synergistic action. A broad array of pyrazoles coupled with iodobenzene avoids expensive palladium metal or salts, and certain designed substrates were attained. Only comparatively inexpensive copper(I)iodide and 1,10-phenanthroline were used all together as the catalyst. The presented technique is a greener way to create C-H arylation of pyrazoles. It significantly reduces the amount of energy needed. Full article

(This article belongs to the Special Issue The Role of Catalysts in Functionalization of C-H and C-C Bonds)

► Show Figures

Figure 1

14 pages, 2490 KiB

Open AccessArticle

Vapor-Phase Photocatalytic Overall Water Splitting Using Hybrid Methylammonium Copper and Lead Perovskites

by Teresa García, Rocío García-Aboal, Josep Albero, Pedro Atienzar and Hermenegildo García

Nanomaterials 2020, 10(5), 960; https://doi.org/10.3390/nano10050960 - 18 May 2020

Cited by 14 | Viewed by 4133

Abstract

Films or powders of hybrid methylammonium copper halide perovskite exhibit photocatalytic activity for overall water splitting in the vapor phase in the absence of any sacrificial agent, resulting in the generation of H₂ and O₂, reaching a maximum production rate of 6 μmol H₂ × g cat⁻¹h⁻¹ efficiency. The photocatalytic activity depends on the composition, degreasing all inorganic Cs₂CuCl₂Br₂ perovskite and other Cl/Br proportions in the methylammonium hybrids. XRD indicates that MA₂CuCl₂Br₂ is stable under irradiation conditions in agreement with the linear H₂ production with the irradiation time. Similar to copper analogue, hybrid methylammonium lead halide perovskites also promote the overall photocatalytic water splitting, but with four times less efficiency than the Cu analogues. The present results show that, although moisture is strongly detrimental to the photovoltaic applications of hybrid perovskites, it is still possible to use these materials as photocatalysts for processes requiring moisture due to the lack of relevance in the photocatalytic processes of interparticle charge migration. Full article

(This article belongs to the Special Issue Synthesis and Applications of Nanomaterials Based on Perovskites)

► Show Figures

Graphical abstract

Search Results (5)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI

Saved Queries

Search Filter Reset All

Years

Feature Papers

Subjects

Journals

Article Types

Countries / Regions

Search Results (5)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI