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We report the growth of large-scale, single-oriented zinc oxide (ZnO) nanowall networks on epitaxial hexagonal boron nitride (h-BN) films and their application to flexible inorganic ultraviolet (UV) light sensors. Using catalyst-free metal-organic vapor phase epitaxy, ZnO nanowall networks with good vertical alignment are grown on epitaxial h-BN films. The single-oriented crystal structure of the ZnO nanostructures on h-BN is investigated using x-ray diffraction (XRD) spectroscopy, and the heteroepitaxial relationship between ZnO and h-BN is revealed through synchrotron radiation XRD. Interestingly, when utilizing the grown ZnO nanostructure as a channel for UV sensors, better performance merits such as a high IUV/Idark ratio, faster recovery time, and low dark current are achieved if h-BN is employed as a growth template. As an example of inorganic flexible optoelectronic device applications, flexible UV sensors are fabricated using ZnO/h-BN heterostructures owing to the insulating and transferrable nature of h-BN substrates. The sensor maintained an excellent performance, even under highly bent conditions. [ABSTRACT FROM AUTHOR]

Purpose: Low-income children with high caries risk are disproportionately affected by poor access to dental care. Retail-based clinics (RBCs) can provide accessible ancillary oral health care. The purposes of this study were: (1) to measure caregivers' acceptance rate of an oral health screening, fluoride varnish (FV) application, and caries risk assessment offered to children on a walk-in basis in an RBC; and (2) to categorize the caries risk and demographics among the participants. Methods: Screenings and FV applications were provided to children younger than 18 years at a Walgreens Health Care Clinic in Baltimore, Md., USA, from October 2016 to October 2017. The acceptance rate and caries risk using the American Dental Association caries risk assessment form were documented. Descriptive statistics and Fisher's exact test were used to analyze the data. Results: Eighty-five children and their caretakers were approached and 32 (38 percent) agreed to participate. Most children had high caries risk (84.3 percent) and a dental home (81.2 percent), but only 50 percent reported visiting their dentist in the last year. Conclusion: Our results demonstrate modest acceptance of FV application for children on a convenience basis. This population had predominantly high caries risk, with poor adherence to follow-up with their dental home. Retail-based dental care should not replace the dental home but could support it by increasing access to preventive dental care in children. [ABSTRACT FROM AUTHOR]