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A portable and low-cost parallel-plate capacitor sensor for alkali and heavy metal ions detection

Journal of Advanced Dielectrics 2018年第4期8卷 28-34页

作者： Septia Kholimatussadiah Tri Anggono Prijo Department of Physics Faculty of Science and Technology Universitas AirlanggaSurabayaIndonesia

A portable and low-cost design of parallel-plate capacitor sensor is proposed and investigated for detection of heavy and alkali metal ions concentration in liquid *** application of a thin and long-sided parallel PCB plate allows one to measure the dielectric response of each sample through capacitive sensing *** measurements were based on the peak output voltage corresponding to the capacitance of the output measured by an oscilloscope with metal ions concentration of the solution varying from 0 to 10 ppm and input frequency ranging from 1 kHz to 10 *** ICF of Li,Na and K in chloride solution was 2.4,2.1 and 1.9 MHz,*** ICF of Na and K in hydroxide solution was 1.5 MHz and 1.1 MHz,respectively,while the ICF of Pb(NO_(3))_(2)was 490 *** detected ICF was applied to further construct the portable sensor system,which is simple in design,low-cost in fabrication and easy to *** finding of ICF of each chemical element is necessary to solve the selectivity challenge of the capacitance-based sensor,which will be appropriate for chemical,environmental and engineering applications.

关键词： Capacitive sensing capacitor sensor characteristic frequency metal ions detection parallel-plate capacitor.

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Hydroxylated graphene quantum dots as fluorescent probes for sensitive detection of metal ions

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International Journal of Minerals,metallurgy and Materials 2020年第1期27卷 91-99页

作者： Qiang Ge Wen-hui Kong Xin-qian Liu Ying-min Wang Li-feng Wang Ning Ma Yan Li Department of Inorganic Nonmetallic Material School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

Highly sensitive methods are important for monitoring the concentration of metal ions in industrial ***,we developed a new probe for the determination of metal ions by fluorescence *** probe consists of hydroxylated graphene quantum dots(H-GQDs),prepared from GQDs by electrochemical method followed by surface *** is a non-reactive indicator with high sensitivity and detection limits of 0.01μM for Cu2+,0.005μM for Al3+,0.04μM for Fe3+,and 0.02μM for Cr3+.In addition,the low biotoxicity and excellent solubility of H-GQDs make them promising for application in wastewater metal ion detection.

关键词： graphene quantum dots surface hydroxylation metal ions detection fluorescent probes

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Formation mechanism and application potential of carbon dots synthesized from palm kernel shell via microwave assisted method

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Carbon Resources Conversion 2022年第2期5卷 150-166页

作者： Thivyah Balakrishnan Wei Lun Ang Ebrahim Mahmoudi Abdul Wahab Mohammad Nonni Soraya Sambudi Department of Chemical and Process Engineering Faculty of Engineering&Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Centre for Sustainable Process Technology Faculty of Engineering&Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Department of Chemical Engineering Universiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia

The present study systematically investigated the influence of synthesis conditions(duration,reaction medium,and doping concentration)and formation mechanism of carbon dots(CDs)derived from low-cost and abundant biomass palm kernel shell(PKS).Surprisingly,the dopant(urea)did not enhance the photoluminescence of CDs as expected,which could be attributed to the low reactivity between the dopant and PKS *** of synthesis duration from 30 to 120 s clearly indicated the formation mechanism of CDs,involving the stages of dehydration,carbonization,and *** CDs with the highest photoluminescent intensity and quantum yield was obtained at synthesis duration of 90 s,aligned well with the perfect spherical shape of CDs and the synergistic effects of both surface and carbogenic core *** the formation mechanism could be used to optimize the synthesis of CDs,and hence linked to quantum yield and fluorescent *** terms of application potential,the CDs illuminated well as fluorescent ink and in bacteria cells *** potential of CDs as sensing material has also been proven with the quenching of fluorescence in the presence of metal *** linear range for detection of Cu2+ions was 0.1–0.5 mM with a detection limit as low as 0.05 *** signifies the potential of CDs fabricated from PKS as a low-cost and easily available material for Cu2+ions detection in aqueous *** CDs possessed reasonable photo stability as indicated by its consistent fluorescence level even after exposure to UV radiation for a prolonged period of 180 ***,a simple,straightforward,and fast method is developed to synthesis strong blue emissive CDs from green PKS that are potentially suitable for Cu2+ions sensing in real application.

关键词： Carbon dots Microwave radiation Palm kernel shell Cell imaging metal ions detection

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