SnS2/SnS p–n heterojunctions with an accumulation layer were rationally designed to achieve ultrasensitive NO2 detection at room temperature.

Biomimetic antireflective Si nanopillar arrays are created using self‐assembled polymer‐sphere monolayers as etching masks (see image). These tapered Si nanopillar arrays can greatly suppress the reflectivity of Si. This method provides a facile approach for producing antireflection (AR) surfaces on large areas with low cost and high throughput.

It is demonstrated that silver nanoparticle (SNP) arrays fabricated by combining nanoimprint lithography and electrochemical deposition methods can be used as substrates for metal-enhanced fluorescence, which is widely used in optics, sensitive detection, and bioimaging. The method presented here is simple and efficient at controlling the nanoparticle density and interparticle distance within one array. Furthermore, it is found that the fluorescence intensity can be tuned by engineering the feature size of the SNP arrays. This is due to the different coupling efficiency between the emission of the fluorophores and surface plasmon resonance band of the metallic nanostructures.

No abstract

SnS2 nanosheets with unique properties are excellent candidate materials for fabricating high-performance NO2 gas sensors. However, serious restacking and aggregation during sensor fabrication have greatly impacted the sensing response. In this study, flower-like hierarchical SnS2 was prepared by a simple microwave method and partially thermally oxidized to form hierarchical SnS2/SnO2 nanocomposites to further improve the sensing performance at low operating temperature. The fabricated SnS2/SnO2 sensor exhibited ultrahigh response (resistance ratio = 51.1) toward 1 ppm NO2 at 100 °C, roughly 10.2 times higher than that of pure SnS2 nanoflowers. The excellent and enhanced NO2 sensing performances of hierarchical SnS2/SnO2 nanocomposites were attributed to the novel hierarchical structure of SnS2 and the nanoheterojunction between SnS2 and the ultrafine SnO2 nanoparticles. The SnS2/SnO2 sensors also exhibited excellent selectivity and reliable repeatability. The simple fabrication of high performance sensing materials may facilitate the large-scale production of NO2 gas sensors.

Driven by anticipation of novel applications, enormous progress has been made in organic semiconductors since the 1950s. Historically, much of the initial work was centered on organic light-emitting diodes (OLEDs) [ 1 , 2 ] and photovoltaics (PVs) [ 3 , 4 ] due to their intensive applications. Owing to efforts from both academia and industry over the last two decades, the research interest has dramatically expanded to transistors, [ 5 ] sensors, [ 6 ] memories, [ 7 ] lasers, [ 8 ] etc. In organic microelectronics and optoelectronics, the ability to create scalable high-resolution patterns of semiconductor organic molecules still presents challenges for fabrication technology. As an example, a full-color microdisplay requires high-resolution red, green, and blue (RGB) OLEDs to be patterned in close proximity of micrometers. Current patterning techniques based on shadow-mask [ 9 ] and vapor-jet printing [ 10 ] suffer from low resolution, poor scalability, and complicated multistep processing. Previously, we demonstrated the template-directed growth technique as a promising method for patterning organic semiconductors with tunable physical properties. [11][12][13] Herein, we show the liquid behavior of appropriately selected dye molecules on prepatterned substrates. By further controlling the diffusion of molecules between designed patterns, we achieve heteropatterning of organic materials, that is, the thickness of organic molecule patterns differs in a controlled way over predefi ned areas. Further deposition of a second type of molecule on the heteropatterned structure produces high-resolution, ordered, triple-color organic patterns using only two dyes.In this study, we use N , N ′ -di[( N -(3,6-di-tertbutylcarbazyl))-n -decyl] quinacridone (DtCDQA), an orange light-emitting material with high quantum yield and multiple emission states in both liquid and solid solvents. [ 13 ]

A novel double-decker structural fluorinated POSS and a diphenol POSS were first synthesized for preparing a unique “cage–cage”-shaped hydrophobic fluoropolymer film with a low dielectric constant.

No abstract