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Ammonia (NH 3 ) is a common air pollutant and is a biomarker for kidney disease. Therefore, the preparation of ammonia gas sensors with high sensitivity, good selectivity and low operating temperature is of great importance for health protection. Using the in situ electrostatic self-assembly approach, a chemoresistive gas sensor based on Co(OH) 2 /Ti 3 C 2 T x hybrid material was created in this study. The prepared samples were characterized by XRD, XPS, TEM, BET and other testing methods for structure, surface topography and elements. These samples were fabricated into sensors, and the gas sensing properties of the materials were investigated under different test conditions. The results show that the gas response value of the C/M-2 sensor is up to about 14.7%/100 ppm, which is three times the response value of the sensor made of pure MXene to NH 3 . In addition, the Co(OH) 2 /Ti 3 C 2 T x hybrid sensors exhibit excellent repeatability, high sensitivity under low concentration (less than 5 ppm), fast response/recovery time (29 s/49 s) and long-time stability, which indicates their promising utility in the IoT field., Competing Interests: There are no conflicts of interest to declare., (This journal is © The Royal Society of Chemistry.)

Right ventricular (RV) hypoplasia with isolated myocardial disease and complete absence of RV trabeculae is a rare congenital heart disease, the current treatment of which is ineffective. Here, a rare case is presented of a middle-aged female patient with RV hypoplasia complicated by tricuspid regurgitation, right atrial thrombus, and atrial fibrillation. The patient was treated with a one-and-a-half ventricular repair, and showed significant improvements in cardiac function and physical activity tolerance. The study results suggest that this surgical approach can significantly improve the prognosis of an adult patient with isolated RV hypoplasia.