Enhanced Photogating Gain in Scalable MoS2 Plasmonic Photodetectors via Resonant Plasmonic Metasurfaces.

Absorption of photons in atomically thin materials has become a challenge in the realization of ultrathin, high-performance optoelectronics. While numerous schemes have been used to enhance absorption in 2D semiconductors, such enhanced device performance in scalable monolayer photodetectors remains unattained. Here, we demonstrate wafer-scale integration of monolayer single-crystal MoS2 photodetectors with a nitride-based resonant plasmonic metasurface to achieve a high detectivity of 2.58 × 1012 Jones with a record-low dark current of 8 pA and long-term stability over 40 days. Upon comparison with control devices, we observe an overall enhancement factor of >100; this can be attributed to the local strong EM field enhanced photogating effect by the resonant plasmonic metasurface. Considering the compatibility of 2D semiconductors and hafnium nitride with the Si CMOS process and their scalability across wafer sizes, our results facilitate the smooth incorporation of 2D semiconductor-based photodetectors into the fields of imaging, sensing, and optical communication applications.

Effects of aerobic walking on cognitive function in patients with schizophrenia: A randomized controlled trial.

Cognitive deficits, which are core manifestations in schizophrenia and exhibit a limited response to antipsychotic treatment, contribute to poor treatment outcomes and functional disability. Evidence on the effect of aerobic walking (AW) and exercise intensity on cognitive function in patients with schizophrenia is lacking. In total, 79 patients with schizophrenia were recruited for a 12-week randomized control trial and allocated to the treatment-as-usual (TAU, n = 38) and treatment-as-usual plus AW (TAW, n = 39) groups. The TAW participants joined a supervised 12-week AW program consisting of 30-min sessions five times per week while wearing a Fitbit Charge 2 device. Cognitive function was evaluated using the Brief Assessment of Cognition in Schizophrenia. After randomization, 67 (34 TAU and 33 TAW) participants joined the 12-week trial and were included in the intention-to-treat analysis. Multivariate general linear model repeated measures analysis revealed no significant time × group interaction effect on cognitive function changes between the TAU and TAW groups and a marginally significant group effect on verbal fluency (p = 0.09). The interaction effect of time and treatment group on verbal fluency (p = 0.05) was marginally significant between the high and low AW intensity groups, whereas a significant group effect on attention and processing speed (p = 0.04) was observed. Supervised 12-week AW of moderate intensity may have potential cognitive benefits for patients with schizophrenia.

Influences of Aerobic Dance on Cognitive Performance in Adults with Schizophrenia.

Cognitive impairment is one of the core features of schizophrenia. This study examined the influences of an aerobic dance programme on the cognitive functions of people with schizophrenia. A quasi-experimental matched-control design was applied. The experimental group (n = 17) participated in a 60-minute aerobic dance group class three times a week for 3 months. The control group (n = 19) participated in colouring and handwriting activities. Cognitive functions were measured before and after the interventions for both groups. The intervention group experienced significant improvements in processing speed, memory and executive function, whereas no significant changes were noted in any measures in the control group. While there were no significant between-group differences, the data showed approximately medium effect sizes that favoured the intervention group in regard to processing speed (Cohen's d = 0.51), memory (d = 0.35-0.41) and the spontaneity and fluency aspects of executive function (d = 0.51). While the small sample size and lack of randomization were the primary methodological shortcomings, this study provides preliminary results supporting aerobic dance as an adjunct activity-based intervention to improve cognitive functions in people with schizophrenia. More rigorous studies are needed to validate the findings. Copyright © 2016 John Wiley & Sons, Ltd.