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    Heterostructures based on cobalt phthalocyanine films decorated with gold nanoparticles for the detection of low concentrations of ammonia and nitric oxide / S. I. Dorovskikh, D. D. Klyamer, E. A. Maksimovskiy [et al.] // Biosensors. - 2022. - Vol. 12, Is. 7. - Ст. 476, DOI 10.3390/bios12070476. - Cited References: 74. - This work was funded by the Russian Science Foundation (grant 21-73-10142). The authors acknowledge the Russian Ministry of Education and Science (project 121031700314-5) for the access to literature search databases. TEM investigations were conducted in the SFU Joint Scientific Center . - ISSN 2079-6374
   Перевод заглавия: Гетероструктуры на основе пленок фталоцианина кобальта, декорированные наночастицами золота, для обнаружения низких концентраций аммиака и оксида азота
Кл.слова (ненормированные):
gold nanoparticles -- cobalt phthalocyanine -- gas-phase deposition -- chemiresistive sensors -- nitric oxide -- ammonia
Аннотация: This work is aimed at the development of new heterostructures based on cobalt phthalocyanines (CoPc) and gold nanoparticles (AuNPs), and the evaluation of the prospects of their use to determine low concentrations of ammonia and nitric oxide. For this purpose, CoPc films were decorated with AuNPs by gas-phase methods (MOCVD and PVD) and drop-casting (DC), and their chemiresistive sensor response to low concentrations of NO (10–50 ppb) and NH3 (1–10 ppm) was investigated. A comparative analysis of the characteristics of heterostructures depending on the preparation methods was carried out. The composition, structure, and morphology of the resulting hybrid films were studied by X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma atomic emission (ICP-AES) spectroscopy, as well as electron microscopy methods to discuss the effect of these parameters on the sensor response of hybrid films to ammonia and nitric oxide. It was shown that regardless of the fabrication method, the response of Au/CoPc heterostructures to NH3 and NO gases increased with an increase in the concentration of gold. The sensor response of Au/CoPc heterostructures to NH3 increased 2–3.3 times compared to CoPc film, whereas in the case of NO it increased up to 16 times. The detection limits of the Au/CoPc heterostructure with a gold content of ca. 2.1 µg/cm2 for NH3 and NO were 0.1 ppm and 4 ppb, respectively. It was shown that Au/CoPc heterostructures can be used for the detection of NH3 in a gas mixture simulating exhaled air (N2—74%, O2—16%, H2O—6%, CO2—4%).

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Держатели документа:
Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev Pr., Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Laboratory of Electron Microscopy, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Dorovskikh, S. I.; Klyamer, D. D.; Maksimovskiy, E. A.; Volchek, V. V.; Zharkov, S. M.; Жарков, Сергей Михайлович; Morozova, N. B.; Basova, T. V.
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    Phthalocyanine-carbon nanotube hybrid materials: Mechanism of sensor response to ammonia from quantum-chemical point of view / P. Krasnov, V. Ivanova, D. Klyamer [et al.] // Chemosensors. - 2022. - Vol. 10, Is. 11. - Ст. 479, DOI 10.3390/chemosensors10110479. - Cited References: 64. - Studies of periodic hybrid materials were performed under the financial support of the Russian Science Foundation (grant 20-12-00175). Studies of the interaction parameters of ammonia molecules with phthalocyanines were carried out under the financial support of the Ministry of Science and Higher Education of the Russian Federation (N 121031700314-5) . - ISSN 2227-9040
   Перевод заглавия: Гибридные материалы фталоцианин-углеродные нанотрубки: механизм сенсорного отклика на аммиак с квантово-химической точки зрения
Кл.слова (ненормированные):
metal phthalocyanine -- carbon nanotubes -- quantum-chemical calculations -- ammonia sensors
Аннотация: Quantum chemical calculations of the geometric and electronic structure of periodic hybrid compounds representing carbon nanotubes (10,0) with zinc phthalocyanine molecules ZnPc-xpy (x = 0, 1, 2, 4) on their surface and their interaction with ammonia were carried out to explain the dependence of the sensor response of the hybrid materials to ammonia on the number of substituents in the ZnPc-xpy macrocycle and to clarify the nature of the interaction between ammonia and phthalocyanine molecules. It was found that the key feature of these materials, which determines their sensor response toward ammonia, is the presence of an impurity band in the band gap of a carbon nanotube, formed by the orbitals of macrocycle atoms. When ammonia adsorbs through the formation of hydrogen bonds with the side atoms of phthalocyanine, the energy of this impurity band decreases. As a consequence, the electron population of the conduction band and, accordingly, the electrical conductivity of the hybrid materials become lower. Moreover, with an increase in the number of oxypyrene substituents in ZnPc-xpy, the interaction energy of ammonia increases and, as a result, the decrease in the energy of the impurity band becomes higher. These facts may explain recent experimental measurements of the parameters of the sensor response of similar hybrid materials to ammonia, where, in particular, it was shown that the sensor response is reversible, and its value increases with an increase in the number of oxypyrene substituents in the phthalocyanine macrocycle.

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Держатели документа:
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, 26 Kirensky St., 660074 Krasnoyarsk, Russia
Nikolaev Institute of Inorganic Chemistry Siberian Branch of the Russian Academy of Sciences SB RAS, 3 Lavrentiev Ave., 630090 Novosibirsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50/38 Akademgorodok, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Krasnov, Pavel; Ivanova, Victoria; Klyamer, Darya; Fedorov, A. S.; Федоров, Александр Семенович; Basova, Tamara
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    Semi-artificial photosynthetic system based on TiO2/Chlorophyll composite and microalgae for N2 fixation / X. Pan, W. Li, Yu. Fang [et al.] // Chem. Eng. J. - 2023. - Vol. 475. - Ст. 146179, DOI 10.1016/j.cej.2023.146179. - Cited References: 45. - The work was supported by the National Natural Science Foundations of China (No. 12274144), the Ministry of Science and Technology of China (No. G2021030022L), the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2022KJ122, 2023KJ122), the Key Realm R&D Program of Guangdong Province (No. 2021B0707010003), the Guangzhou Science & Technology Project (No. 202103000059), the Guangdong Provincial Science and Technology Project (No. 2021A0505050006), and the Project of GDUPS (2018) for Prof. Bingfu LEI . - ISSN 1385-8947. - ISSN 1873-3212
   Перевод заглавия: Полуискусственная фотосинтетическая система на основе композита TiO2/Хлорофилл и микроводорослей для фиксации N2
Кл.слова (ненормированные):
Microalgae -- Titanium -- Ubiquinone-0 -- Ammonia
Аннотация: Significant process has been made on the development of semi-artificial photosynthesis catering to the production of H2– and CO2– derived value-added products. But there are little reports on the application of semi-artificial photosynthetic system to nitrogen fixation areas. In this study we report the successful and highly efficient N2 fixation in one step at room temperature and ambient pressure by constructing new semi-artificial photosynthetic systems based on material-cell hybrids and microbial photo-electrolysis cells (MPECs). Improved TiO2/Chlorophyll composite that annealed at 400 °C was selected as electron donator to replenish additional electrons to Nostoc commune Vauch microalgae cell for N2 fixation. Ubiquinone-0 (2,3-dimethoxy-5-methyl-1,4-benzoquinone, Q0) was selected as electron relay that guarantees efficient transmission of electrons from abiotic material to microalgae cells. Determined by an ammonia assay kit, at constant concentration of microalgae, the constructed material-cell hybrid system photosynthetically synthesized 40.67 μM/h ammonia, while H-shape MPECs synthesized 132.70 μM/h, 19.23 times higher than that produced by pure microalgae. Using 15N2 as the reduction gas, the constructed H-shape MPECs photosynthetically synthesized 28.37 μM/h 15NH4+, 2.80 time higher than that of the MPECs without Q0 as electron relay.

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Держатели документа:
Key Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk Scientific Center, Siberian Branch of Russian Academy of Science, Academgorodolk 50 bld.38, 660036, Russia
WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, Western Australia 6102, Australia
Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Foshan 528216, China

Доп.точки доступа:
Pan, Xiaoqin; Li, Wei; Fang, Yueping; Zhang, Haoran; Xiao, Yong; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ping Jiang, San; Liu, Yingliang; Lei, Bingfu
}
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