White-light-emitting diodes have many advantages over forms of lighting - incandescent, fluorescent and halogen - and this solid-state lighting technique is bound to make major inroads into the commercial and household markets. Researchers have now designed precursors and chemical processes to synthesize intercrossed carbon nanomaterials with relatively pure hydroxy surface states for the first time, which enable them to overcome the aggregation-induced quenching (AIQ) effect, and to emit stable yellow-orange luminescence in both colloidal and solid states.
Most printed electronics applications rely on some kind of ink formulated with conductive nanomaterials. Researchers have now introduced a rapid and facile method to fabricate a foldable capacitive touch pad using silver nanowire inks. The team developed a technique that uses a 2D programmed printing machine with postdeposition sintering using a camera flash light to harden the deposited silver nanowire ink. resulting paper-based touchpads produced by direct writing with silver nanowire inks offer several distinct advantages over existing counterparts.
The food chemistry Maillard reaction is responsible for many colors and flavors in foods - roasting of coffee, baking of bread and sizzling of meat. Scientists have made use of this ingenious food chemistry to 'cook' their copper nanowires. This green approach that formulates copper atoms in water to form untangled metallic state nanowires. Naturally, a lingering chocolate-like aroma was detected during the copper nanowires synthesis.
A new review article examines opportunities and practical challenges that nanotechnology applications pose in addressing the guiding principles for a green economy. There is a general perception that nanotechnologies will have a significant impact on developing 'green' and 'clean' technologies with considerable environmental benefits. The associated concept of green nanotechnology aims to exploit nanotech-enabled innovations in materials science and engineering to generate products and processes that are energy efficient as well as economically and environmentally sustainable.
Studying the complex wiring of neural circuits and identifying the details of how individual neural circuits operate in epilepsy and other neurological disorders requires real-time observation of their locations, firing patterns, and other factors. These observations depend on high-resolution optical imaging and electrophysiological recording. Researchers have now developed a completely transparent graphene microelectrode that allows for simultaneous optical imaging and electrophysiological recordings of neural circuits.
In recent years, polymer solar cells have drawn considerable research interest due to their attractive features including flexibility, semi-transparency, and manufacturability using cost-effective continuous printing processes. However, one challenge limiting their commercialization is the relatively low power conversion efficiency when compared to inorganic solar cells. New work shows that low bandgap polymer solar cells with high efficiency of 5.5% can be fabricated using nanoimprint lithography.
Researchers are confident that graphene may outperform existing transparent conductive materials. However, monolayer graphene might not be sufficient for fabricating a highly conductive electrode. The dilemma is that the transmittance of graphene film decreases as the number of layers increases. It therefore is of great importance to have a fast and reliable method to determine the number of layers in the fabrication and measurement of multilayer graphene.
Researchers have demonstrated that they can print interwoven structures of quantum dots, polymers, metal nanoparticles, etc, to create the first fully 3D printed LEDs, in which every component is 3D printed. At the fundamental level, 3D printing should be entirely capable of creating spatially heterogeneous multi-material structures by dispensing a wide range of material classes with disparate viscosities and functionalities, including semiconducting colloidal nanomaterials, elastomeric matrices, organic polymers, and liquid and solid metals.