H2S sensors based on SnO2 films: RGTO verses RF sputtering

Sunlight assisted photodegradation by tin oxide quantum dots

“…Apart from that a weak Raman band is observed at 432 cm À 1 in SnQ on deconvoluting the broad band seen in the original Raman spectra in the region 400-650 cm À 1 which is contributed to deeper oxygen vacancies [36]. And strong Raman band is also seen at 569 (SnQ) and 563 cm À 1 (SnQ300) and are related to the presence of oxygen vacancies in the samples [26].…”

Facile one-pot synthesis of heterostructure SnO2/ZnO photocatalyst for enhanced photocatalytic degradation of organic dye

“…The rst peak at 529.79 eV was attributed to the lattice oxygen in Sn-O-Sn. 69,70 The second peak at 530.80 eV was assigned to the lattice oxygen of ZnO. 71 The higher binding energy at 531.8 eV was attributed to the chemisorbed oxygen on the surface of SnO 2 /ZnO.…”

Molecularly Engineered Quantum Dots for Visualization of Hydrogen Sulfide

“…Recently, chemiresistive gas sensors based on thin films of metal oxides have been extensively explored for gaseous H 2 S. 39,40 As compared to these methods, ratiometric fluorescence methods use two independent fluorescence signals: one is sensitive to hydrogen sulfide, and the other is inert and acts as an internal standard. Thus, the main advantage of the present method is the built-in correction for measuring conditions, such as probe concentration and excitation source power.…”

“…Traditional approaches including metal-induced sulfide precipitation, colorimetric, electrochemical, and gas chromatography have been employed for the detection of trace H 2 S. − Although these methods can meet the sensitivity requirements, the operation often requires tedious and strict sample preparation procedures. Recently, chemiresistive gas sensors based on thin films of metal oxides have been extensively explored for gaseous H 2 S. , As compared to these methods, ratiometric fluorescence methods use two independent fluorescence signals: one is sensitive to hydrogen sulfide, and the other is inert and acts as an internal standard. Thus, the main advantage of the present method is the built-in correction for measuring conditions, such as probe concentration and excitation source power. ,,− The ratiometric method also can achieve visualization of the analyte on the basis of fluorescence intensities ratios at two wavelengths, which are more favorable for practical applications (Supporting Information Table S1). ,,− …”