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Zhenzhen Xie, Mandapati V. Ramakrishnam Raju , Prasadanie K. Increasing both the sensitivity and selectivity of thiol-functionalized gold nanoparticle chemiresistors remains a challenging issue in the quest to develop real-time gas sensors. The effects of thiol molecular structure on such sensor properties are not well understood. This study investigates the effects of steric as well as electronic effects in a panel of substituted thiol-urea compounds on the sensing properties of thiolate monolayer-protected gold nanoparticle chemiresistors. Three series of urea-substituted thiols with different peripheral end groups were synthesized for the study and used to prepare gold nanoparticle-based chemiresistors. The responses of the prepared sensors to trace volatile analytes were significantly affected by the urea functional motifs. The largest response for sensing acetone among the three series was observed for the thiol-urea sensor featuring a tert-butyl end group. The results show that the peripheral molecular structure of thiolate-coated gold nanoparticles plays a critical role in sensing target analytes. Effect of thiol molecular structure on the sensitivity of gold nanoparticle-based chemiresistors toward carbonyl compounds. The Impact Of Carbonyl Compounds On The

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Research article 14 Oct Laboratory experiments were carried out to determine sulfur isotope effects during ultraviolet photolysis of carbonyl sulfide OCS to carbon monoxide CO and elemental sulfur S 0. The OCS gas at 3. IImpact isotope ratios for the product S 0 and residual OCS were analyzed by an isotope ratio mass-spectrometer with SF 6 as the analyte gas.

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The measured isotope effect reflects that of photolysis as well as the subsequent sulfur abstraction from OCS reaction. These values differ from canonical values for mass-dependent fractionation of 0.

Annales Geophysicae. Atmospheric Measurement Techniques.

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Climate of the Past. Earth Surface Dynamics. Earth System Dynamics. Geoscience Communication.

Geoscientific Instrumentation, Methods and Data Systems. Geoscientific Model Development. Hydrology and Earth System Sciences. Natural Hazards and Earth System Sciences. Nonlinear Processes in Geophysics.

Ocean Science. Solid Earth. The Cryosphere. Weather and Climate Dynamics. Advances in Geosciences. Encyclopedia of Geosciences. Journal topic ACP. Author Title Abstract Full text. User ID. Journal metrics. IF 5-year 5.

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Te 9. SNIP 1. IPP 5. SJR 2. Scimago H index Volume 11, issue Article Peer review Metrics Related articles. Volume 11, issue 19 Atmos. This work is distributed under the Creative Commons Attribution 3. Supplement KB. How to cite: Lin, Y. Search articles Https://amazonia.fiocruz.br/scdp/essay/writing-practice-test-online/a-writ-moral-philosophy.php Title Abstract Full text.]