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Low-dimensional semiconductor nanostructures, particularly in the form of nanowire configurations with large surface-to-volume-ratio, offer intriguing optoelectronic properties for the advancement of integrated photonic technologies. Here, a bias-controlled, superior dual-functional broadband light detecting/emitting diode enabled by constructing the aluminum-gallium-nitride-based nanowire on the silicon-platform is reported. Strikingly, the diode exhibits a stable and high responsivity (R) of over 200 mAW-1 covering an extremely wide operation band under reverse bias conditions, ranging from deep ultraviolet (DUV: 254 nm) to near-infrared (NIR: 1000 nm) spectrum region. While at zero bias, it still possesses superior DUV light selectivity with a high off-rejection ratio of 106. When it comes to the operation of the light-emitting mode under forward bias, it can achieve large spectral changes from UV to red simply by coating colloid quantum dots on the nanowires. Based on the multifunctional features of the diodes, this study further employs them in various optoelectronic systems, demonstrating outstanding applications in multicolor imaging, filterless color discrimination, and DUV/NIR visualization. Such highly responsive broadband photodetector with a tunable emitter enabled by III-V nanowire on silicon provides a new avenue toward the realization of integrated photonics and holds great promise for future applications in communication, sensing, imaging, and visualization.
RESUMO
AIMS AND OBJECTIVES: To evaluate the effectiveness of aromatherapy on agitation and aggression in patients with cognitive impairment. BACKGROUND: The impact of aromatherapy on agitation and aggression has been evaluated in various studies, but there is uncertainty about their impact. DESIGN: A meta-analysis of randomised controlled trials was undertaken. METHODS: This meta-analysis was conducted under PRISMA guidelines. Following eight electronic literature databases were searched: Web of Science, PubMed, PsycINFO, Embase, Cochrane Library, Chinese Wanfang database, CNKI and VIP digital database from the inception of the databases up to 27 February 2021. Two reviewers assessed the risk of bias of the included studies independently using the Cochrane Collaboration tool. Overall, meta-analysis and three subgroup analyses regarding the type of aroma preparations, delivery mode and session length were performed using RevMan5.3 and stata14.0. Publication bias was assessed by visual inspection of the funnel plot asymmetry and Egger's regression test. RESULTS: Fifteen studies comprising 693 participants were included. The meta-analysis indicated that aromatherapy could ameliorate agitation and aggression for cognitive impairment. The subgroup analysis based on the type of aroma preparations showed that lavender oil could significantly improve agitation and aggression. Most delivery modes of aromatherapy, including smearing and inhalation, were effective. Moreover, less length (≤4 weeks) aromatherapy showed a better effect on agitation behaviour than aromatherapy more than 4 weeks. CONCLUSIONS: Despite the meta-analysis indicating that aromatherapy could alleviate agitation and aggression especially short-term (≤4 weeks) aromatherapy inhalation in different conditions, further researches are needed to investigate the appropriate dosage of essential oils and the side effects. More well-designed randomised controlled trials containing participants from more countries are needed to verify our findings before we can make strong recommendations. RELEVANCE TO CLINICAL PRACTICE: This meta-analysis suggested that aromatherapy should be considered as a complementary programme for patients with cognitive impairment patients. Medical workers could apply aromatherapy into daily routine cares for cognitive impairment patients.