Yttrium Doping of Perovskite Oxide LaTiO Nanosheets for Enhanced Proton Conduction and Gas Sensing Under HighHumidity Levels.

Water molecules from the environment or human breath are one of the main factors affecting the accuracy, efficiency, and long-term stability of electronic gas sensors. In this contribution, yttrium (Y)-doped LaTiO (LTO) nanosheets were synthesized by a hydrothermal reaction, demonstrating improved proton conductivity compared to their non-doped counterparts. The response of Y-doped LTO with the optimal doping concentration to 100 ppm NO at 43% relative humidity (RH) was -21%, which is four times higher than that of bare LaTiO.

Hydrothermal Synthesis of Single-Crystal Europium Tungstate Hydroxide Nanobelts for Enhanced Humidity Sensing.

Humidity sensing is crucial for environmental monitoring and industrial processes; however, existing sensors often face challenges in sensitivity and response time. This study addresses these challenges by introducing a novel material, EuWO(OH) nanobelts, synthesized through a hydrothermal method. These nanobelts exhibit exceptional sensing performance, with a response value of 2.

Enhancing perovskite solar cells efficiency through cesium fluoride mediated surface lead iodide modulation.

The presence of an excessive amount of lead iodide on the surface of perovskite solar cells (PSCs) is a significant contributing factor that adversely affects the stability of these devices when exposed to continuous light. To address this issue, we developed an effective strategy involving polishing PbI on a perovskite surface using CsF. In this study, we investigated the effects of CsF post-treatment on perovskite films and their photovoltaic properties.

Engineering NiCoS nanoparticles anchored on carbon nanotubes as superior energy-storage materials for supercapacitors.

Fabricating high-capacity electrode materials toward supercapacitors has attracted increasing attention. Here we report a three-dimensional CNTs/NiCoS nanocomposite material synthesized successfully by a facile one-step hydrothermal technique. As expected, a CNTs/NiCoS electrode shows remarkable capacitive properties with a high specific capacitance of 890 C g at 1 A g.

Room-temperature epitaxial welding of 3D and 2D perovskites.

Formation of epitaxial heterostructures via post-growth self-assembly is important in the design and preparation of functional hybrid systems combining unique properties of the constituents. This is particularly attractive for the construction of metal halide perovskite heterostructures, since their conventional solution synthesis usually leads to non-uniformity in composition, crystal phase and dimensionality. Herein, we demonstrate that a series of two-dimensional and three-dimensional perovskites of different composition and crystal phase can form epitaxial heterostructures through a ligand-assisted welding process at room temperature.

Promoting optoelectronic properties of CsAgBiBr nanocrystals by formation of heterostructures with BiOCl nanosheets.

Lead halide perovskite nanocrystals and their heterostructures have achieved substantial advances in optoelectronics; however, their inherent material instability and lead toxicity have driven research on alternative material systems. Herein, solution-processable heterostructures composed of lead-free double perovskite CsAgBiBr nanocrystals and BiOCl nanosheets were prepared through a colloidal synthesis method. Defect states were present in BiOCl and benefited carrier generation, recombination and transport in CsAgBiBr.

Preparation of Micron-sized Methylamine-PbCl perovskite grains by controlling phase transition engineering for selective Ultraviolet-harvesting transparent photovoltaics.

Selective ultraviolet-harvesting transparent perovskite solar cells (T-PSCs) have attracted great interest because of their high transmittance and unique photovoltaic properties, especially in the fields of smart windows for power generation and building glass. However, owing to the unsatisfactory solubility of PbCl in most conventional solvents, preparing transparent methylammonium lead chloride (MAPbCl) films with high quality and sufficient thickness by conventional methods poses a substantial challenge for their application deployment in T-PSCs. In this work, two novel strategies based on an ion-exchange procedure for controlling phase transition engineering (CPTE) are proposed.

Heterostructures between a tin-based intermetallic compound and a layered semiconductor for gas sensing.

SnS2 nanoplates are used as sacrificial templates to facilitate the in situ growth of intermetallic compound Pt3Sn nanoparticles. The Pt3Sn/SnS2 heterostructures show promise for selective NO2 sensing due to the favored gas adsorption and gas-solid charge transfer on Pt3Sn, combined with the optimized film conductance and formation of ohmic-type Pt3Sn/SnS2 heterointerfaces.