4 research outputs found
Luminomagnetic bifunctionality of Mn2+-bonded graphene oxide/reduced graphene oxide two dimensional nanosheets
Herein, we report the luminomagnetic bifunctional properties of two-dimensional (2D) Mn2+ bonded graphene oxide (GO)/reduced graphene oxide (RGO) nanosheets synthesized using a facile route of oxidation followed by a solvothermal reduction method. Photoluminescence (PL) studies (excited by different wavelengths) revealed that the resonant energy transfer between Mn2+ and sp(3)/sp(2) clusters of GO/RGO is responsible for the enhancement of emissions. Moreover, pH-sensitive PL behaviors have also been investigated in detail. The ferromagnetic behavior is believed to arise due to defects in Mn2+ bonded GO composites. Thus, present reduction method provides a direct route to tune and enhance the optical properties of GO and RGO nanosheets bonded with Mn2+ ions, which creates an opportunity for various technological applications
Field emission properties of highly ordered low-aspect ratio carbon nanocup arrays
Herein, we design and develop a field emission device utilizing highly porous carbon nanocup (CNC) films. These three-dimensional (3D) low-aspect ratio CNC structures were fabricated by a combination of anodization and chemical vapor deposition techniques. The low turn-on fields of 2.30 V mu m(-1) were observed to draw an emission current density of 1 mu A cm(-2) and a maximum emission current density of similar to 1.802 mA cm(-2) drawn at an applied field of similar to 4.20 V mu m(-1). The enhanced field emission behavior observed from the CNC films is attributed to an excellent field enhancement factor of 1645. The observed field emission properties of CNC arrays are attributed to a synergistic combination of high aspect ratio, nano-sized radius of curvature, highly organized distribution of the emitters over the whole area of specimen and lower screening effect of the CNC arrays. These observations shed light on the effect of the stacking carbon layers of CNC on their electronic properties and open up possibilities to integrate new morphologies of graphitic carbon in nanotechnology applications. Thus, the low turn on field, high emission current density and better emission current stability enable CNC based future field emission applications
Tuberculosis: integrated studies for a complex disease 2050
Tuberculosis (TB) has been a disease for centuries with various challenges [1]. Like
other places where challenges and opportunities come together, TB challenges were
the inspiration for the scientific community to mobilize different groups for the
purpose of interest. For example, with the emergence of drug resistance, there has
been a huge volume of research on the discovery of new medicines and drug
delivery methods and the repurposing of old drugs [2, 3]. Moreover, to enhance the
capacity to detect TB cases, studies have sought diagnostics and biomarkers, with
much hope recently expressed in the direction of point-of-care tests [4].
Despite all such efforts as being highlighted in 50 Chapters of this volume, we
are still writing about TB and thinking about how to fight this old disease–implying
that the problem of TB might be complex, so calling the need for an integrated
science to deal with multiple dimensions in a simultaneous and effective manner.
We are not the first one; there have been proposed integrated platform for TB
research, integrated prevention services, integrated models for drug screening,
integrated imaging protocol, integrated understanding of the disease pathogenesis,
integrated control models, integrated mapping of the genome of the pathogen, etc.
[5–12], to name some.
These integrated jobs date back decades ago. So, a question arises: why is there a
disease named TB yet? It might be due to the fact that this integration has happened
to a scale that is not global, and so TB remains to be a problem, especially in
resource-limited settings.
Hope Tuberculosis: Integrated Studies for a Complex Disease helps to globalize
the integrated science of TB.info:eu-repo/semantics/publishedVersio