A novel, miniaturized and easy-to-use optical sensor enabling accurate humidity measurement in real-time has been proposed in current study. This is achieved by the compact integration of a photonic chip with an artificial opal layer. The III-nitride chip with a size of 1×1×0.21 mm3 simultaneously provides two essential functions, i.e., photoemission and photodetection. The integrated opal film is

A novel quantification technique is presented for electronic nose (E-nose), which is based on a double-step strategy combined with hierarchical classifier (HC) and partial least squares regression (PLSR). With the tree structure of HC, the complexity of classifier training process can be reduced in the case of unbalanced samples. For each level of the class hierarchy, the extreme learning machine-based

A facile solvothermal method was employed to synthesize hollow urchin-like core-shell spinel structured ZnO/ZnFe2O4 composite and pure ZnFe2O4 sensing material. As the ratios of Zn to Fe in the precursor are different the final components of the products were also different. Many techniques were used to characterize the crystalline, component and morphology of the as-prepared product. The results revealed

Mixed potential gadolinia-doped ceria (GDC)-based gas sensors using a double perovskite composite oxide (Sr2NiMoO6) were fabricated to detect ethanol. The influence of the sensing materials sintered at different temperatures on the sensor properties was investigated. The results showed that Sr2NiMoO6 annealed at 1000 °C was the most suitable sensing material for detecting ethanol due to its suitable

Exosomes are secreted in the early stage of cancer at low levels that are difficult to detect due to the complex interferents of the sample matrix. Improved cancer detection requires the development of an accurate, reliable, and reusable method to assay exosomes. Here, a regenerable electrochemical biosensor was developed for exosomes detection based on the dual-recognition proximity binding-induced

Carbon nanotubes have enjoyed unflagging popularity in recent years. They are successfully used in many fields of science, including potentiometry for the construction of ion selective electrodes with solid contact. A new type of SC-ISEs sensitive to nitrate(V) ions using multiwalled carbon nanotubes-ionic liquid nanocomposite was prepared. The effect of the kind of carbon nanotubes on the parameters

Correction for ‘Development of ultrasensitive and As(III)-selective upconverting (NaYF4:Yb3+,Er3+) platform’ by Suman Duhan et al., Analyst, 2020, 145, 6378–6387, DOI: 10.1039/D0AN00717J.

Ammonia gas (NH3) as a harmful and toxic gas species severely threatens ecological harmony and human health, thus necessitating its sensitive detection at very low dose. In this regard, two-dimensional (2D) nanomaterials have been extensively harnessed as the sensing layers due to the unique merits of large surface area, intriguing layer-dependent electrical behaviors and versatile modifications. Of

In this paper, an indirect strategy based on the pH-dependent molecular form conversion was established for rapid, selective detection of the total paraoxon (methyl paraoxon (MP) and ethyl paraoxon (EP)) by using UV−Vis spectroscopy. Under pH 13, the paraoxon (λmax 275 nm) can be quickly hydrolyzed to 4-nitrophenol (4-NP) in 5 min at 50 ℃, with hydrolysis efficiencies of 96.63% (MP) and 96.27% (EP)

A label-free and enzyme-free signal-on biosensor for Hg(II) ions was constructed based on T-Hg(II)-T nanoladders and fluorescent DNA-templated silver nanoclusters/graphene oxide nanocomposites (DNA-AgNCs/GO). The T-rich sequences (P1 and P2) were used to capture Hg(II) and form the T-Hg(II)-T nanoladders. C6G5C6 was extended at the 5′ end of P1, used as a template for synthesizing fluorescent DNA-AgNCs

Head and neck squamous cell carcinoma (HNSCC) is the 6th most common cancer worldwide. For better diagnosis and precise resection of HNSCC, Fluorescent probe has been developed as an ideal tool to visualize tumor sites and to detect biological molecules. However, the targeting strategies of small molecular probes are limited. We designed probe RB-PN (Rhodamine biotin-peroxynitrite) with both sodium-dependent

Selective gas leakage detection is crucial due to the adverse effects of harmful gases present in the air on human health. However, existing high-temperature metal oxide gas sensors, which consume more power, are nonspecific and more sensors are required to discriminate different gases. On the other hand, room temperature gas sensors suffer from slow response and poor reliability despite their low

Foodborne pathogens are still a significant source of morbidity and mortality worldwide. In addition to this the current methodologies to track these microorganisms cannot cope with the current intensive production systems, thus novel methods are of outmost importance. DNA-based methods have already demonstrated suitable to address this issue, but most of them are targeted methods such as real-time