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RISS 인기검색어
- 검색키워드
- 저자 : Thongsai, Nichaphat (검색결과 4 건)
- 무료
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Thongsai, Nichaphat,Jaiyong, Panichakorn,Kladsomboon, Sumana,In, Insik,Paoprasert, Peerasak Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.487 No.-
<P><B>Abstract</B></P> <P>Carbon dots are emerging carbon-based nanomaterials because of their unique optical properties, high surface area, and surface chelating functional groups. In this work, carbon dots were prepared from jackfruit using a one-step hydrothermal method and used as a sensing layer in an optical electronic nose for the real-time detection of acetone vapor at room temperature. The carbon dots showed blue photoluminescence with excitation-dependent fluorescence emission, excellent photostability, and a quantum yield of 5.2%. Using principal component analysis, the carbon dot-integrated electronic nose was able to distinguish acetone from hexane, ethanol, methanol, and water and between different concentrations of acetone in ethanol and aqueous solutions. From the time-dependent density functional theory calculations, an increase in carbon dot's extinction coefficients in bulk solvents was in a good agreement with the optical electronic nose results. The calculations of interaction energy using density functional theory method illustrated the electronic coupling and interfacial interactions between carbon dots and acetone and other volatile organic compounds. Interestingly, the unique ambipolar properties of carbon dots were computationally demonstrated. Furthermore, the photoluminescence of carbon dots was also exploited for the detection of acetone in aqueous solutions. Based on this work, our jackfruit-derived carbon dots were demonstrated to be versatile sensing materials for acetone in vapor and solution, and the computational methods highlighted the importance of interfacial electronic coupling towards unique sensing properties of carbon dots.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Blue-emitting carbon dots were prepared from jackfruit with a quantum yield of 5.2%. </LI> <LI> They were used for the real-time detection of acetone vapor and other VOCs. </LI> <LI> Interaction energies between carbon dots and VOCs were calculated using DFT methods. </LI> <LI> Ambipolar properties of carbon dots were computationally demonstrated. </LI> <LI> Carbon dots were also exploited for the detection of acetone in aqueous solutions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Microwave-assisted synthesis of luminescent and biocompatible lysine-based carbon quantum dots
최유진,Nichaphat Thongsai,Ari Chae,조성호,강은비,Peerasak Paoprasert,박성영,인인식 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Water-soluble carbon quantum dots presenting strong blue photoluminescence with the quantum yieldup to 23.3% are simply prepared by microwave treatment of lysine as a building block within 5 min inhousehold microwave oven. The formation of lysine-based carbon quantum dots is estimated to proceedthrough the microwave induced thermal polyamidation and the subsequent carbonization reaction. More importantly, the control experiments using the other amino acids having linear structures revealsthat the branched molecular structure of lysine (AB2 type polyamidation monomer) is one of prerequisitepoints to obtain strongly luminescent carbon quantum dots with high mass yield. Lysine-based carbonquantum dots are highly nontoxic and biocompatible, enabling bioimaging of cellular media with highdegree of pysiological safety.
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Microwave-assisted synthesis of luminescent and biocompatible lysine-based carbon quantum dots
Choi, Yujin,Thongsai, Nichaphat,Chae, Ari,Jo, Seongho,Kang, Eun Bi,Paoprasert, Peerasak,Park, Sung Young,In, Insik Elsevier 2017 Journal of industrial and engineering chemistry Vol.47 No.-
<P><B>Abstract</B></P> <P>Water-soluble carbon quantum dots presenting strong blue photoluminescence with the quantum yield up to 23.3% are simply prepared by microwave treatment of lysine as a building block within 5min in household microwave oven. The formation of lysine-based carbon quantum dots is estimated to proceed through the microwave induced thermal polyamidation and the subsequent carbonization reaction. More importantly, the control experiments using the other amino acids having linear structures reveals that the branched molecular structure of lysine (AB<SUB>2</SUB> type polyamidation monomer) is one of prerequisite points to obtain strongly luminescent carbon quantum dots with high mass yield. Lysine-based carbon quantum dots are highly nontoxic and biocompatible, enabling bioimaging of cellular media with high degree of pysiological safety.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CQDs showing strong fluorescence are simply prepared from lysine through microwave assisted pyrolysis. </LI> <LI> Lysine-based CQDs are less than 10nm and have amorphous carbonic cores and amine and hydroxyl functionality in their surface. </LI> <LI> The use of lysine as an AB2 type amino acid possessing branching point is the key for the successful synthesis CQDS. </LI> <LI> Lysine-based CQDs are highly nontoxic and biocompatible, enabling bioimaging of cellular media with high degree of physiological safety. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Dela Cruz, Ma. Ivy S.,Thongsai, Nichaphat,de Luna, Mark Daniel G.,In, Insik,Paoprasert, Peerasak Elsevier 2019 Colloids and surfaces. A, Physicochemical and engi Vol.568 No.-
<P><B>Abstract</B></P> <P>In this study, novel carbon dots were synthesized from polyurethane foam via a one-step pyrolysis method. Polyurethane foam is an interesting precursor for carbon dot synthesis because: (1) polyurethane foam waste generation is alarmingly high and (2) polyurethane is rich in nitrogen content which is important for producing highly photoluminescent carbon dots. The carbon dot synthesis parameters namely acid concentration, reaction time, and reaction temperature were modeled and optimized using Box-Behnken design (BBD) of response surface methodology (RSM). Temperature was found to be the most important parameter affecting the photoluminescence quantum efficiency of the carbon dots. The as-prepared carbon dots in aqueous solution showed a blue-green emission under UV light with a relatively high quantum yield of 33%, agreeing well with the value predicted using the RSM. The carbon dots exhibited distinct selectivity toward silver ion (Ag<SUP>+</SUP>) with a limit of detection of 2.8 μM. The Ag<SUP>+</SUP> contents in real water samples were accurately determined with acceptable repeatability. Based on these results, the RSM is a useful tool for investigating the effects of reaction parameters on the quantum efficiency of carbon dots. Furthermore, pyrolysis was proved to be an effective means for producing label-free, highly photoluminescent carbon dots from polyurethane, enabling new, effective recycling strategy and various potential sensing applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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