All-Inorganic Perovskite Nanowires–InGaZnO Heterojunction for High-Performance Ultraviolet–Visible Photodetectors

Inorganic cesium lead halide perovskites have attracted intense interest in optoelectronic applications due to the relatively stable performance in air. However, most reported inorganic perovskite-based optoelectronic devices exhibit low photosensitivity, which greatly hinders their further applications. Here, we first demonstrate a hybrid optical structure, which combines the n-type thin-film InGaZnO and the all-inorganic perovskite nanowires of CsPbBr₃ together. By this way, excellent optical and electrical properties such as a low dark current of 10^–10 A (at −5 V), a high <i>I</i>_ph/<i>I</i>_dark of 1.2 × 10⁴, a response time of 2 ms and photoresponsivity of 3.794 A/W have been obtained. It is also found that the photodetector shows good stability in air ambient for 2 months with little reduction in performance. Moreover, such hybrid photodetectors exhibit enhanced photocurrent and <i>I</i>_ph/<i>I</i>_dark in high-temperature environment. This work paves a new way for high-performance photodetectors and points out the possible application of the inorganic cesium lead halide perovskites in harsh environment

Reduced Graphene Oxide/Mesoporous ZnO NSs Hybrid Fibers for Flexible, Stretchable, Twisted, and Wearable NO₂ E‑Textile Gas Sensor

E-textiles are gaining growing popularity recently due to low cost, light weight, and conformable compatibility with clothes in wearable and portable smart electronics. Here, an easy-handing, low cost, and scalable fabricating strategy is reported to fabricate conductive, highly flexible, and mechanically stretchable/twisted fiber gas sensor with great wearability and knittability. The proposed gas sensor is built using commercially available cotton/elastic threads as flexible/stretchable templates and reduced graphene oxide/mesoporous zinc oxide nanosheets as sensing layers to form conducting fibers. The as-prepared fiber demonstrates sensitive sensing response, excellent long-term stability (84 days), low theoretical detection limit (43.5 ppb NO2), great mechanical deformation tolerance (3000 bending cycles, 1000 twisting cycles and 65% strain strength), and washing durability in room-temperature gas detection. More significantly, scalable wearable characteristics including repairability, reliability, stability, and practicability have been efficiently improved, which are achieved by knotting the fractured fibers, incorporating multiple sensors in series/parallel and weaving multisensor array networks integrated into clothes. The good sensing properties, superior flexibility, and scalable applications of wearable fibers may provide a broad window for widespread monitoring of numerous human activities in personal mobile electronics and human–machine interactions

DataSheet_1_Risk of preeclampsia by gestational weight gain in women with varied prepregnancy BMI: A retrospective cohort study.docx

IntroductionDespite the important clinical significance, limited data on the joint contribution of prepregnancy body mass index (BMI) and gestational weight gain (GWG) to preeclampsia, the second leading cause of maternal mortality worldwide. This study aimed to estimate the risk of preeclampsia by GWG among women with varied prepregnancy BMI.MethodsWe conducted a retrospective cohort study using data of 117 738 singleton pregnant women aged 18–49 years from 150 maternity hospitals in China between 2015 and 2018. GWG was calculated as the measured weight at the time of preeclampsia assessment minus prepregnancy weight; GWG velocity was calculated as the GWG divided by the gestational age at weighing. The non-linear associations of GWG with preeclampsia were examined by restricted cubic spline regression analysis according to prepregnancy BMI. The association of the GWG categories with preeclampsia was further examined by performing robust Poisson regression stratified by the prepregnancy BMI categories.ResultsAmong participants, 2426 (2.06%) were diagnosed with preeclampsia. Compared to women with normal BMI, those who were overweight and obese had 1.92- fold (95%CI, 1.73–2.14) and 5.06- fold (95%CI, 4.43–5.78) increased risks for preeclampsia, respectively. The association of GWG velocity with preeclampsia was presented as a J-shaped curve with the varied inflexion point (where the rate of preeclampsia was 2%), which was 0.54, 0.38, and 0.25 kg/week in women with normal BMI, overweight, and obesity, respectively; a steep risk rise was observed along with GWG velocity beyond the inflexion points. The overall adjusted relative risk for preeclampsia was calculated among women with the different GWG categories of GWG.ConclusionsThe findings highlight that high prepregnancy BMI and exceed GWG contributed to increased risk of preeclampsia with a superimposed effect and underscore the need to optimize the recommendations for GWG for women with different prepregnancy BMI.</p

Table_1_Association of Gestational Vitamin E Status With Pre-eclampsia: A Retrospective, Multicenter Cohort Study.DOC

IntroductionPre-eclampsia is the second leading cause of maternal mortality worldwide. The controversy for the association of vitamin E with pre-eclampsia has raged unabated for two decades. We aimed to determine the association of vitamin E level in the first trimester and the gestational change with pre-eclampsia.Materials and MethodsA retrospective cohort study was conducted among singleton pregnant women aged 15–49 years at 137 hospitals in China. Serum vitamin E concentrations in the first trimester and at pre-eclampsia assessment time were uniformly quantified in a laboratory by high performance liquid chromatography. Logistic regression models with restricted cubic splines were performed to reveal a non-linear association of vitamin E concentrations in the first trimester and the gestational change with pre-eclampsia.ResultsWe included 73 317 participants (47.8% aged 25–29 years) and 2.28% were diagnosed with pre-eclampsia. Higher risk was observed in those with lower concentration in the first trimester and greater gestational decrease, with a range from 0.81 to 80.60%. A non-linear L-shaped association was observed between vitamin E concentrations in the first trimester and pre-eclampsia, suggesting a threshold at 7.3 mg/L and a ceiling effect: the risk saw a steep rise when the concentrations in the first trimester were ConclusionWe demonstrated alarmingly high pre-eclampsia risk in women with vitamin E concentrations of < 7.3 mg/L in the first trimester and gestational vitamin E decrease. These findings underscore the need to supplement vitamin E among pregnant women with low baseline status.</p

Thickness Tunable Wedding-Cake-like MoS₂ Flakes for High-Performance Optoelectronics

Atomically thin transition-metal dichalcogenides (TMDCs) have received substantial interest due to their typical thickness-dependent optical and electronic properties and related applications in optoelectronics. However, the large-scale, thickness-tunable growth of such materials is still challenging. Herein, we report a fast growth of thickness-tunable wedding-cake-like MoS2 flakes on 6-in. soda-lime glass by using NaCl-coated Mo foils as metal precursors. The MoS2 thicknesses are tuned from one layer (1L) to >20L by controlling the concentrations of NaCl promoter. To attest to the ultrahigh crystal quality, related devices based on 1L–multilayer MoS2 lateral junctions have been constructed and display a relatively high rectification ratio (∼103) and extra high photoresponsitivity (∼104 A/W). Thanks to the scalable sizes, uniform distributions of the flakes and homogeneous optical properties, the applications in ultraviolet (UV) irradiation filtering eyewear are also demonstrated. Our work should hereby propel the scalable production of layer-controlled TMDC materials as well as their optical and optoelectrical applications