Current ammonia sensors exhibit cross-sensitivity to water vapor, leading to false alarms. We developed a core–shell nanofiber (CSNF) structure to address these issues, using conductive poly(3,4-ethylenedioxythiophene) (PEDOT) as the core and hydrophobic polyvinylidene fluoride-tetrafluoroethylene (PVDF-TrFE) as the shell. The PEDOT-PVDF CSNF, with a diameter of ~500 nm and a 300 nm thick PVDF layer, showed a superior sensitivity and humidity resistance compared to conventional PEDOT membranes for ammonia concentrations of 10–100 ppm. In humid environments, CSNF sensors outperformed membrane sensors, exhibiting a tenfold increase in performance at 51% relative humidity (RH). This study highlights the potential of CSNF sensors for practical ammonia detection, maintaining a high performance under varying humidity levels.

Cancer cells predominantly utilize aerobic glycolysis for energy production, preferentially converting glucose (Glu) to pyruvate (PA) and subsequently to lactate (LA). This metabolic reprogramming results in extracellular LA accumulation, acidifying the tumor microenvironment (TME) and facilitating tumor invasion and metastasis. The dynamics of Glu, PA, and LA are pivotal to tumor initiation and progression. This review comprehensively discussed therapeutic strategies targeting these key metabolites and systematically evaluates electrochemical and fluorescence-based techniques for their dynamic monitoring. We highlight the critical role of these monitoring approaches in advancing early cancer diagnosis, enabling personalized treatment, and accelerating anticancer drug development.