5 research outputs found
Torsional Force Microscopy of Van der Waals Moir\'es and Atomic Lattices
In a stack of atomically-thin Van der Waals layers, introducing interlayer
twist creates a moir\'e superlattice whose period is a function of twist angle.
Changes in that twist angle of even hundredths of a degree can dramatically
transform the system's electronic properties. Setting a precise and uniform
twist angle for a stack remains difficult, hence determining that twist angle
and mapping its spatial variation is very important. Techniques have emerged to
do this by imaging the moir\'e, but most of these require sophisticated
infrastructure, time-consuming sample preparation beyond stack synthesis, or
both. In this work, we show that Torsional Force Microscopy (TFM), a scanning
probe technique sensitive to dynamic friction, can reveal surface and shallow
subsurface structure of Van der Waals stacks on multiple length scales: the
moir\'es formed between bilayers of graphene and between graphene and hexagonal
boron nitride (hBN), and also the atomic crystal lattices of graphene and hBN.
In TFM, torsional motion of an AFM cantilever is monitored as the it is
actively driven at a torsional resonance while a feedback loop maintains
contact at a set force with the surface of a sample. TFM works at room
temperature in air, with no need for an electrical bias between the tip and the
sample, making it applicable to a wide array of samples. It should enable
determination of precise structural information including twist angles and
strain in moir\'e superlattices and crystallographic orientation of VdW flakes
to support predictable moir\'e heterostructure fabrication.Comment: 28 pages, 14 figures including supplementary material
The Australian longitudinal study on male health-methods
Abstract Background The Australian Longitudinal Study on Male Health (Ten to Men) was established in 2011 to build the evidence base on male health to inform policy and program development. Methods Ten to Men is a national longitudinal study with a stratified multi-stage cluster random sample design and oversampling in rural and regional areas. Household recruitment was conducted from October 2013 to July 2014. Males who were aged 10 to 55Â years residing in private dwellings were eligible to participate. Data were collected via self-completion paper questionnaires (participants aged 15 to 55) and by computer-assisted personal interview (boys aged 10 to 14). Household and proxy health data for boys were collected from a parent via a self-completion paper-based questionnaire. Questions covered socio-demographics, health status, mental health and wellbeing, health behaviours, social determinants, and health knowledge and service use. Results A cohort of 15,988 males aged between 10 and 55Â years was recruited representing a response fraction of 35Â %. Conclusion Ten to Men is a unique resource for investigating male health and wellbeing. Wave 1 data are available for approved research projects