Biological redox cycling amplification in a self-powered photoelectrochemical sensor based on TiO/CdInS/ g-CN-WO photoanode for sensitive detection of Hg.

A photoelectrochemical (PEC) sensor is proposed with a TiO/CdInS co-sensitive structure and a g-CN-WO heterojunction as the photoanode to form a self-powered system. The photogenerated hole-induced biological redox cycle of TiO/CdInS/g-CN-WO composites is used as a signal amplification strategy for Hg detection. In the test solution, ascorbic acid is first oxidized by the photogenerated hole of the TiO/CdInS/g-CN-WO photoanode, which triggers the ascorbic acid－glutathione cycle to achieve signal amplification and increase the photocurrent.

NIR II light response-based PDA/AuPt@CuS composites: Simultaneous readout of temperature and pressure sensing strategy for portable detection of pathogenic bacteria.

In this study, we developed a simultaneous readout of pressure and temperature dual-signals platform based on the second near-infrared (NIR II) light response-based polydopamine (PDA)-functionalized-AuPt nanoparticles (NPs)@CuS nanosheets (PDA/AuPt@CuS NS) composite. Due to the excellent NIR photothermal performance of PDA/AuPt@CuS NS, it contribute to the decomposition of HO and NHHCO to generate gases (including O, CO, and NH can be promoted, which can amplify the pressure signals in a sealed container. A sandwich mode is formed between FeO NPs and PDA/AuPt@CuS NS based on the dual-aptamer when target pathogenic bacteria is present.

Colorimetric and handheld pH meter dual-signal readout platform for E. coli detection based on a cascade reaction.

A dual-signal readout has been designed detecting platform based on a cascade reaction for Escherichia coli (E. coli) detection by using colorimetric approach and a handheld pH meter. The immunoreaction was conducted using polydopamine@copper ferrite-Ag nanoparticles (PDA@CuFeO-Ag NP) and a glucose oxidase (GOD)-conjugated graphene oxide-gold nanosheet composite (GOD-GO/Au NS) to synthesize a sandwich complex mode between targets.

A simple colorimetric method based on "on-off-on" mode for detection of HS and Hg in water.

It is of great significance to develop efficient platforms for the detection of hypertoxic Hg and HS. Colorimetric have received much attention for the detection of HS and Hg in the last decades. In this work, an "on-off-on" mode colorimetric method based on MnO/multi-wall carbon nanotubes (MnO/MWCNTs) composite was constructed.

A ratiometric electrochemical strategy based on Fe (III) and Pt (IV) for immobilization-free detection of .

A new ratiometric electrochemical strategy for immobilization-free detection of () was constructed by using a capture DNA-polyaniline/copper ferrite nanoparticles/graphene oxide (cDNA-PANI/CuFeO/GO) composite as capture probes, which has a high specific surface area and good magnetic properties. Then trigger DNA/Au nanoparticles (tDNA/Au NPs) were used as signal amplification labels, and Pt (IV) and Fe (III) were chosen as the signal probes. In the presence of targets, the sandwich format among cDNA-PANI/CuFeO/GO, and auxiliary DNA (aDNA) was realized by using the aptamer recognition system.

Signal-on photoelectrochemical immunoassay for salivary cortisol based on silver nanoclusters-triggered ion-exchange reaction with CdS quantum dots.

Nowadays, the epidemic, employment, and academic pressures are seriously affecting our physical and mental health. Herein, we designed a magneto-controlled photoelectrochemical immunosensor for noninvasive monitoring of salivary cortisol regarded as a pressure biomarker. A competitive immunoassay model was established by coupling bovine serum albumin-cortisol modified magnetic beads (MB-BSA-cortisol) with silver nanoclusters (Ag NCs)-labelled anti-cortisol antibody, and quantity analysis was operated by photoelectrochemical measurement of the CdS/Au electrode as an ion-exchange platform.

Kinetic trapping of a cobalt(ii) metallocage using a carbazole-containing expanded carbaporphyrinoid ligand.

The -unsubstituted expanded porphyrinoid 3, incorporating two carbazole moieties, acts as an effective ligand for Co(ii) and permits the isolation and X-ray diffraction-based characterization of a 6 : 3 metal-to-ligand metallocage complex that converts spontaneously to the constituent 2 : 1 metal-to-ligand metalloring species in chloroform solution. The discrete metalloring is formed directly when the Co(ii) complex is crystallized from supersaturated solutions, whereas crystallization from more dilute solutions favors the metallocage. Studies with two other test cations, Pd(ii) and Zn(ii), revealed exclusive formation of the monomeric metalloring complexes with no evidence of higher order species being formed.