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Micromachines
Volume 14
Issue 5
10.3390/mi14050980
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Article

Unraveling an Ultrafast Electron Transport Mechanism in a Photocatalytic “Micromachine” for Their Potential Light Harvesting Applications

by
Nivedita Pan
1,
Lopamudra Roy
2,
Md. Nur Hasan
1,
Amrita Banerjee
3,
Ria Ghosh
1,
Meshari A. Alsharif
4,
Basim H. Asghar
4,
Rami J. Obaid
4,
Arpita Chattopadhyay
5,
Ranjan Das
6,
Saleh A. Ahmed
4,7,* and
Samir Kumar Pal
1,*
1
Department of Chemical and Biological Sciences, S.N. Bose National Centre for Basic Sciences, Salt Lake, Block JD, Sector 3, Kolkata 700106, India
2
Department of Applied Optics and Photonics, University of Calcutta, 92, Acharya Prafulla Chandra Rd, Machuabazar, Kolkata 700009, India
3
Department of Physics, Jadavpur University, 188, Raja S.C. Mallick Rd, Kolkata 700032, India
4
Department of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah 21955, Saudi Arabia
5
Department of Basic Science and Humanities, Techno International New Town, Block-DG 1/2 New Town, Action Area 1, Kolkata 700156, India
6
Department of Chemistry, West Bengal State University, Barasat, North 24 Parganas, Kolkata 700126, India
7
Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt
*
Authors to whom correspondence should be addressed.
Micromachines 2023, 14(5), 980; https://doi.org/10.3390/mi14050980
Submission received: 31 March 2023 / Revised: 28 April 2023 / Accepted: 28 April 2023 / Published: 29 April 2023
(This article belongs to the Special Issue Organic Bioelectronics for Bioengineering Application)
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Abstract

Following the seminal discovery of Richard Feynman, several micromachines have been made that are capable of several applications, such as solar energy harvesting, remediation of environmental pollution, etc. Here we have synthesized a nanohybrid combining TiO2 nanoparticle and light harvesting robust organic molecule RK1 (2-cyano-3-(4-(7-(5-(4-(diphenylamino)phenyl)-4-octylthiophen-2-yl)benzo[c][1,2,5] thiadiazol-4-yl)phenyl) acrylic acid) as a model micromachine having solar light harvesting ability potential for application in photocatalysis, preparation of solar active devices, etc. Detailed structural characterization, including High Resolution Transmission Electronic Microscopy (HRTEM) and Fourier-transform infrared spectroscopy (FTIR), has been performed on the nanohybrid. We have studied the excited-state ultrafast dynamics of the efficient push-pull dye RK1 in solution, on mesoporous semiconductor nanoparticles, and in insulator nanoparticles by streak camera (resolution of the order of 500 fs). The dynamics of such photosensitizers in polar solvents have been reported, and it has been observed that completely different dynamics occur when they are attached to the surface of the semiconductor/insulator nanosurface. A femtosecond-resolved fast electron transfer has been reported when photosensitizer RK1 has been attached to the surface of the semiconductor nanoparticle, which in turn plays a crucial role in the development of an efficient light harvesting material. The generation of reactive oxygen species as a result of femtosecond-resolved photoinduced electron injection in the aqueous medium is also investigated in order to explore the possibility of redox-active micromachines, which are found to be crucial for efficient and enhanced photocatalysis.
Keywords: D-π-A organic photosensitizer; wide band gap semiconductor; photocatalysis; ultrafast femtosecond dynamics D-π-A organic photosensitizer; wide band gap semiconductor; photocatalysis; ultrafast femtosecond dynamics

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MDPI and ACS Style

Pan, N.; Roy, L.; Hasan, M.N.; Banerjee, A.; Ghosh, R.; Alsharif, M.A.; Asghar, B.H.; Obaid, R.J.; Chattopadhyay, A.; Das, R.; et al. Unraveling an Ultrafast Electron Transport Mechanism in a Photocatalytic “Micromachine” for Their Potential Light Harvesting Applications. Micromachines 2023, 14, 980. https://doi.org/10.3390/mi14050980

AMA Style

Pan N, Roy L, Hasan MN, Banerjee A, Ghosh R, Alsharif MA, Asghar BH, Obaid RJ, Chattopadhyay A, Das R, et al. Unraveling an Ultrafast Electron Transport Mechanism in a Photocatalytic “Micromachine” for Their Potential Light Harvesting Applications. Micromachines. 2023; 14(5):980. https://doi.org/10.3390/mi14050980

Chicago/Turabian Style

Pan, Nivedita, Lopamudra Roy, Md. Nur Hasan, Amrita Banerjee, Ria Ghosh, Meshari A. Alsharif, Basim H. Asghar, Rami J. Obaid, Arpita Chattopadhyay, Ranjan Das, and et al. 2023. "Unraveling an Ultrafast Electron Transport Mechanism in a Photocatalytic “Micromachine” for Their Potential Light Harvesting Applications" Micromachines 14, no. 5: 980. https://doi.org/10.3390/mi14050980

APA Style

Pan, N., Roy, L., Hasan, M. N., Banerjee, A., Ghosh, R., Alsharif, M. A., Asghar, B. H., Obaid, R. J., Chattopadhyay, A., Das, R., Ahmed, S. A., & Pal, S. K. (2023). Unraveling an Ultrafast Electron Transport Mechanism in a Photocatalytic “Micromachine” for Their Potential Light Harvesting Applications. Micromachines, 14(5), 980. https://doi.org/10.3390/mi14050980

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