An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO na... more An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO nanostructures (NS) fabricated by thermal vapor deposition technique were associated with a large number of oxygen vacancies on the surface. These oxygen vacancies induced changes in the DNA conformation which further reflected through changes in the persistence length of the DNA molecules. This indicates a reinforcement of the bonds and binding in both the phosphate and the base regions of the DNA molecules with the positively charged core vacancy sites on the ZnO nanostructured surface through strong interaction mediated via long-range electrostatic forces which effectively reduced the end-to-end distance of the λ-DNA molecule. This strongly suggests a transition of the λ-DNA molecule through structural modification into a more compact higher-order fractal dimension from its native state.
Journal of Materials Science: Materials in Electronics, Feb 10, 2022
A label-free electrochemical sensor based on carboxylated $$\hbox {MoS}_2$$ MoS 2 flakes function... more A label-free electrochemical sensor based on carboxylated $$\hbox {MoS}_2$$ MoS 2 flakes functionalized with poly (Thymine) has been demonstrated to detect $$\hbox {Hg}^{2+}$$ Hg 2 + ions in the aqueous medium at 100 femtomolar (fM) concentrations level. The electrochemical voltammetric technique was utilized to detect Hg(II) ions based on specific thymine-Hg $$^{2+}$$ 2 + -thymine conjugation, and the response signal was found varying linearly with mercury concentrations. The proposed sensor offered low detection limits and high selectivity in competitive experiments with realistic other interfering metal ions concentrations. The optimized procedure with tuned functionalization has been applied to several real samples like tap and river waters with good results. Further, the sensor offered long-term stability and excellent recovery after immediate reuse, which ensures the true potential of the proposed sensor for sustainable use toward trace amount determination of $$\hbox {Hg}^{2+}$$ Hg 2 + ions in the potable water and cost-effective environmental monitoring purposes.
The chiral molecules are potential generators of high spin-filters due to their inherent inversio... more The chiral molecules are potential generators of high spin-filters due to their inherent inversion asymmetric helical electric field. We report a controlled spin-selective transmission of electrons through self-assembled monolayers of 15 base-paired double-stranded deoxyribonucleic acid functionalized with two enantiomeric cysteine molecules on gold explored through the quantum mechanical tunneling effect. We observed a controlled spin polarization of 33% with dextro-cysteine, whereas a mere 8% was observed with levo-cysteine molecules using these functionalizations at room temperature. The manipulation of electron’s spin merely through such a small molecule could lead to significant advancement in the spin-dependent charge transport phenomena and related applications.
Journal of Materials Science: Materials in Electronics
A label-free electrochemical sensor based on carboxylated MoS2\\documentclass[12pt]{minimal} \\us... more A label-free electrochemical sensor based on carboxylated MoS2\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\hbox {MoS}_2$$\\end{document} flakes functionalized with poly (Thymine) has been demonstrated to detect Hg2+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\hbox {Hg}^{2+}$$\\end{document} ions in the aqueous medium at 100 femtomolar (fM) concentrations level. The electrochemical voltammetric technique was utilized to detect Hg(II) ions based on specific thymine-Hg2+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^{2+}$$\\end{document}-thymine conjugation, and the response signal was found varying linearly with mercury concentrations. The proposed sensor offered low detection limits and high selectivity in competitive experiments with realistic other interfering metal ions concentrations. The optimized procedure with tuned functionalization has been applied to several real samples like tap and river waters with good results. Further, the sensor offered long-term stability and excellent recovery after immediate reuse, which ensures the true potential of the proposed sensor for sustainable use toward trace amount determination of Hg2+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\hbox {Hg}^{2+}$$\\end{document} ions in the potable water and cost-effective environmental monitoring purposes.
An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO na... more An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO nanostructures (NS) fabricated by thermal vapor deposition technique were associated with a large number of oxygen vacancies on the surface. These oxygen vacancies induced changes in the DNA conformation which further reflected through changes in the persistence length of the DNA molecules. This indicates a reinforcement of the bonds and binding in both the phosphate and the base regions of the DNA molecules with the positively charged core vacancy sites on the ZnO nanostructured surface through strong interaction mediated via long-range electrostatic forces which effectively reduced the end-to-end distance of the λ-DNA molecule. This strongly suggests a transition of the λ-DNA molecule through structural modification into a more compact higher-order fractal dimension from its native state.
An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO na... more An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO nanostructures (NS) fabricated by thermal vapor deposition technique were associated with a large number of oxygen vacancies on the surface. These oxygen vacancies induced changes in the DNA conformation which further reflected through changes in the persistence length of the DNA molecules. This indicates a reinforcement of the bonds and binding in both the phosphate and the base regions of the DNA molecules with the positively charged core vacancy sites on the ZnO nanostructured surface through strong interaction mediated via long-range electrostatic forces which effectively reduced the end-to-end distance of the λ-DNA molecule. This strongly suggests a transition of the λ-DNA molecule through structural modification into a more compact higher-order fractal dimension from its native state.
Journal of Materials Science: Materials in Electronics, Feb 10, 2022
A label-free electrochemical sensor based on carboxylated $$\hbox {MoS}_2$$ MoS 2 flakes function... more A label-free electrochemical sensor based on carboxylated $$\hbox {MoS}_2$$ MoS 2 flakes functionalized with poly (Thymine) has been demonstrated to detect $$\hbox {Hg}^{2+}$$ Hg 2 + ions in the aqueous medium at 100 femtomolar (fM) concentrations level. The electrochemical voltammetric technique was utilized to detect Hg(II) ions based on specific thymine-Hg $$^{2+}$$ 2 + -thymine conjugation, and the response signal was found varying linearly with mercury concentrations. The proposed sensor offered low detection limits and high selectivity in competitive experiments with realistic other interfering metal ions concentrations. The optimized procedure with tuned functionalization has been applied to several real samples like tap and river waters with good results. Further, the sensor offered long-term stability and excellent recovery after immediate reuse, which ensures the true potential of the proposed sensor for sustainable use toward trace amount determination of $$\hbox {Hg}^{2+}$$ Hg 2 + ions in the potable water and cost-effective environmental monitoring purposes.
The chiral molecules are potential generators of high spin-filters due to their inherent inversio... more The chiral molecules are potential generators of high spin-filters due to their inherent inversion asymmetric helical electric field. We report a controlled spin-selective transmission of electrons through self-assembled monolayers of 15 base-paired double-stranded deoxyribonucleic acid functionalized with two enantiomeric cysteine molecules on gold explored through the quantum mechanical tunneling effect. We observed a controlled spin polarization of 33% with dextro-cysteine, whereas a mere 8% was observed with levo-cysteine molecules using these functionalizations at room temperature. The manipulation of electron’s spin merely through such a small molecule could lead to significant advancement in the spin-dependent charge transport phenomena and related applications.
Journal of Materials Science: Materials in Electronics
A label-free electrochemical sensor based on carboxylated MoS2\\documentclass[12pt]{minimal} \\us... more A label-free electrochemical sensor based on carboxylated MoS2\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\hbox {MoS}_2$$\\end{document} flakes functionalized with poly (Thymine) has been demonstrated to detect Hg2+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\hbox {Hg}^{2+}$$\\end{document} ions in the aqueous medium at 100 femtomolar (fM) concentrations level. The electrochemical voltammetric technique was utilized to detect Hg(II) ions based on specific thymine-Hg2+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^{2+}$$\\end{document}-thymine conjugation, and the response signal was found varying linearly with mercury concentrations. The proposed sensor offered low detection limits and high selectivity in competitive experiments with realistic other interfering metal ions concentrations. The optimized procedure with tuned functionalization has been applied to several real samples like tap and river waters with good results. Further, the sensor offered long-term stability and excellent recovery after immediate reuse, which ensures the true potential of the proposed sensor for sustainable use toward trace amount determination of Hg2+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\hbox {Hg}^{2+}$$\\end{document} ions in the potable water and cost-effective environmental monitoring purposes.
An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO na... more An exotic condensation of DNA molecules is observed on the nanostructured ZnO surface. The ZnO nanostructures (NS) fabricated by thermal vapor deposition technique were associated with a large number of oxygen vacancies on the surface. These oxygen vacancies induced changes in the DNA conformation which further reflected through changes in the persistence length of the DNA molecules. This indicates a reinforcement of the bonds and binding in both the phosphate and the base regions of the DNA molecules with the positively charged core vacancy sites on the ZnO nanostructured surface through strong interaction mediated via long-range electrostatic forces which effectively reduced the end-to-end distance of the λ-DNA molecule. This strongly suggests a transition of the λ-DNA molecule through structural modification into a more compact higher-order fractal dimension from its native state.
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Papers by Chittatosh Pal