Article
Chemistry, Multidisciplinary
MinSoung Kang, Geonhee Lee, Kiyoung Jang, Du Won Jeong, Jeong-O Lee, Hyunwoo Kim, Yong Ju Kim
Summary: This study found that graphene quantum dots (GQDs) can accelerate the protein crystallization process and potentially modify the structure and dynamics of the protein. The binding of GQDs to the protein may enhance the crystallization process by reducing protein flexibility.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Anastasiia Kobyliukh, Karolina Olszowska, Marcin Godzierz, Aleksandra Kordyka, Jerzy Kubacki, Yevgen Mamunya, Slawomira Pusz, Ivanka Stoycheva, Urszula Szeluga
Summary: Various facile approaches were used to prepare hybrids of graphene nanoplatelets and graphene oxide with iron oxides nanoparticles. The effects of graphene material and preparation procedures on the hybrids' structural characteristics were studied, and potential applications in various fields were discussed.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Taiwo Hassan Akere, Aline M. Z. de Medeiros, Diego Stefani T. Martinez, Bashiru Ibrahim, Hanene Ali-Boucetta, Eugenia Valsami-Jones
Summary: This study successfully synthesized a graphene oxide-gold nanohybrid (GO-Au) and evaluated its suitability as a test material in nano(ecotoxicological studies. Graphene oxide was synthesized and used as a substrate for the growth of nano-Au decorations. The nanohybrid showed good stability in different environmental media and its physicochemical characteristics did not deteriorate over a period of months.
Article
Engineering, Electrical & Electronic
Hsueh-Tao Chou, Yong-Sen Liao, Tien-Ming Wu, Shih-Han Wang, Kuan-Hua Chiang, Wei-Chao Su
Summary: This study presents the development of a localized surface plasmon resonance (LSPR) based optical fiber biosensor. The sensitivity of the sensor is improved by modifying the surface of fiber probes with gold nanoparticles (AuNPs) and graphene oxide (GO) to form a nanocomposite film. The immobilized fiber probes exhibit quicker reaction and larger resonant wavelength shift compared to the AuNPs fiber probe. In addition, the GO/AuNPs fiber probe shows better sensitivity, linearity, and a lower limit of detection in a low concentration of mouse IgG detection.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Abeer S. Altowyan, Gangareddy Jagannath, K. Keshavamurthy, M. I. Sayyed
Summary: We optimized the concentration of alkali (sodium) oxide in the glass matrix and studied the characteristics of gold nanoparticles embedded in zinc borate-based glass hosts for nonlinear optical properties. We found that glasses containing 30 mol% sodium oxide had the maximum third-order nonlinear optical features. By thermal treating the gold nanoparticles with the optimized glass host at different dwell times near the glass transition temperature, we were able to tune the nonlinear optical characteristics. The results showed that increasing the alkali content in the glass composition led to improved nonlinear optical absorption, refraction, and third-order nonlinear optical susceptibility due to increased formation of gold nanoparticles.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Aristeidis Stathis, Zoi Bouza, Ioannis Papadakis, Stelios Couris
Summary: The impact of in situ UV photoreduction on the nonlinear optical response of graphene derivatives was studied. The results showed that the nonlinear optical properties of the derivatives changed significantly after UV irradiation, offering a simple and effective strategy for tuning their optical response.
Article
Chemistry, Applied
Asaithampi Ganesan, Ali Husain, Mathew Sebastian, Saad Makhseed
Summary: Improving the non-linear absorption properties of graphene materials is crucial for optical limiting applications. The hybrid materials formed by non-covalent functionalisation of graphene nanoplatelets with pyrene-conjugated Zn(II) phthalocyanines and azaphthalocyanines show promising non-linear optical characteristics, such as three-photon absorption behavior and unique optical limiting performance. These hybrid structures offer a way to achieve large effective three-photon absorption coefficients and nearly constant optical limitation across a wide intensity range, which would be highly beneficial for non-linear photonic applications.
Article
Multidisciplinary Sciences
Celia L. Gomez, O. Zaca Moran, M. Rojas-Lopez, C. Moran-Raya, P. Zaca-Moran
Summary: This study reports the nonlinear optical response of graphene oxide quantum dots (GOQDs) produced through the carbonization and exfoliation of electrospun polyacrylonitrile (PAN) fibers. The characterization of electrospun and carbonized fibers was done using SEM and XPS. The GOQDs obtained were characterized using PL, UV-Vis, Raman spectroscopy, and HRTEM. The nonlinear characterization showed a saturable absorption behavior, indicating potential applications in optical switching.
Article
Electrochemistry
F. Yusoff, A. R. Rosli, H. Ghadimi
Summary: A new electrode was developed in this research for detecting dopamine in urine samples, with improved detection performance using synthesized nanocomposite materials. The electrode showed high sensitivity and selectivity towards dopamine detection, offering a potential method for electrochemical sensing in human samples.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
Richa Pandey, Naveen Singhal, Parveen Kumar, Kuldeep Choudhary, Santosh Kumar
Summary: This study proposes a low-cost glucose sensing method using graphene oxide (GO) and gold nanoparticles (AuNPs). The method involves the synthesis of GO and AuNPs using modified methods, and the use of various analysis techniques to study their structure and morphology. The results show that the addition of GO improves the performance of the sensor.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Analytical
Shimayali Kaushal, Anil Kumar, Sanjeev Soni, Nitin Kumar Singhal
Summary: A hybrid antibody biosensor based on graphene oxide-coated gold nanoparticles was developed for fast, specific, and high sensitivity foodborne bacterial detection. The biosensor showed colorimetric and spectrophotometric changes up to 10(3) and 10(2) CFU, respectively, when incubated with Escherichia coli and Salmonella typhimurium for 5 minutes. Immobilized antibodies on the hybrid nanoparticle biosensor were specific to bacteria and exhibited specific photoablation of bacteria upon infrared exposure. This antibody-functionalized biosensor allowed for rapid optical detection and extermination of foodborne bacteria.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
D. Mathivanan, K. S. Shalini Devi, G. Sathiyan, Ankit Tyagi, V. A. O. P. da Silva, B. C. Janegitz, Jai Prakash, Raju Kumar Gupta
Summary: This study introduces an electrochemical sensor based on nanocomposites of polypyrrole, graphene oxide, and gold nanoparticles for efficient detection of hydrogen peroxide, showing high sensitivity and a wider linear response range. The sensor exhibited high stability and repeatability in practical applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Review
Biochemical Research Methods
Aisling Fleming, Lorenzo Cursi, James A. Behan, Yan Yan, Zengchun Xie, Laurent Adumeau, Kenneth A. Dawson
Summary: This review discusses the fundamental obstacles in designing successful bionanoconstructs and emphasizes the importance of surface architecture and thorough characterization of engineered bionanoconstructs, as well as the significance of population heterogeneity in interpreting in vitro and in vivo results.
BIOCONJUGATE CHEMISTRY
(2022)
Article
Chemistry, Physical
Zhanpo Han, Xiaoyan Zhang, Hua Yuan, Zhende Li, Guangzhen Li, Huayu Zhang, Yeqiang Tan
Summary: This study investigates a promising electrochemical sensor with GO/AuNP-modified electrodes to improve charge transport and sensitivity for glucose detection. The sensor shows a linear response and low detection limit, with good selectivity for other interfering molecules.
JOURNAL OF POWER SOURCES
(2022)
Article
Biophysics
Tais Monteiro Magne, Thamires de Oliveira Vieira, Bianca Costa, Luciana Magalhaes Rebelo Alencar, Eduardo Ricci-Junior, Rui Hu, Junle Qu, Camilo Zamora-Ledezma, Frank Alexis, Ralph Santos-Oliveira
Summary: Nanotechnology has significant importance in various fields such as medical, electronic, and environmental sciences. The use of graphene and its derivative composite materials in biomedicine is increasing, but further research is needed to understand how their physico-chemical properties influence biological responses.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2021)
Article
Chemistry, Physical
Pravrati Taank, Riyanka Karmakar, Rituraj Sharma, Rajesh Kumar Yadav, Megha Shrivastava, Naresh Chandra Maurya, Tuhin Kumar Maji, Debjani Karmakar, K. Adarsh
Summary: This study investigates the carrier recombination mechanism in photoexcited MoS2 nanosheets by using transient absorption spectroscopy. The results show that free carriers have a much slower recombination rate compared to excitons, while excitons generated from near quasi-particle excitation have a faster recombination time associated with defect capture.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Dipendranath Mandal, Megha Shrivastava, Sudarshan Sharma, Ajay K. Poonia, Sourav Marik, Ravi Prakash Singh, K. V. Adarsh
Summary: This study experimentally demonstrates the carrier-induced sign reversal of the ultrafast third-order nonlinear optical response in few-layer ReS2 nanoflakes. By controlling the thermalization time of the carriers, the transition from saturable absorption to reverse saturable absorption is achieved. The results suggest that few-layer ReS2 can be used as a high-performance optical limiter material.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Junxiong Hu, Jiangbo Luo, Yuntian Zheng, Jiayu Chen, Ganesh Ji Omar, Andrew Thye Shen Wee, A. Ariando
Summary: This review focuses on the magnetic proximity effects at the interface of 2D materials and magnetic oxide insulators, highlighting the unique spin-related phenomena and the fabrication of multifunctional hybrid devices based on spin transport.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Santu K. Bera, Suman Bera, Megha Shrivastava, Narayan Pradhan, K. V. Adarsh
Summary: This study reports the design strategy of facet engineering to reduce the gain threshold of semiconductor nanocrystal lasers. By controlling the Auger recombination rates and thermalization time through the number of facets, the gain threshold can be significantly reduced. Decreasing the sample temperature further reduces the gain threshold.
Article
Optics
Riyanka Karmakar, Dipendranath Mandal, Megha Shrivastava, K. V. Adarsh
Summary: In this study, we investigate the third-order nonlinear optical response of highly luminescent WS2 quantum dots. Our findings demonstrate their potential applications in optical limiting and quantum information processing, and suggest a promising route for the development of low-dimensional optoelectronic devices.
Article
Physics, Multidisciplinary
G. J. Omar, W. L. Kong, H. Jani, M. S. Li, J. Zhou, Z. S. Lim, S. Prakash, S. W. Zeng, S. Hooda, T. Venkatesan, Y. P. Feng, S. J. Pennycook, L. Shen, A. Ariando
Summary: We have successfully controlled the Rashba spin-orbit interaction by tuning the asymmetric hybridization between Ti orbitals at the LaAlO3/SrTiO3 interface. This was achieved by introducing a LaFeO3 layer, which altered the lattice polarization and trapped charge carriers, resulting in a large Rashba effect at the interface without external bias. Our findings, verified through experimental and computational methods, open new avenues for controlling Rashba interaction and designing next-generation spin orbitronics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Hong Yan, Shengwei Zeng, Km Rubi, Ganesh Ji Omar, Zhaoting Zhang, Michel Goiran, Walter Escoffier, Ariando Ariando
Summary: Due to the presence of defects, the mobility of carriers is limited in 5d transition metal oxides-based devices. However, the LaAlO3/KTaO3 interface system, controlled by ionic liquid gating, exhibits very high mobility, which is related to 2D superconductivity and a large Rashba spin-orbit coupling.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Physical
Madhuri Jash, Arijit Jana, Ajay K. Poonia, Esma Khatun, Papri Chakraborty, Ankit Nagar, Tripti Ahuja, K. V. Adarsh, Thalappil Pradeep
Summary: Superstructures made by assemblies of metal nanoclusters (NCs) with atomic precision and exciting photophysical properties have been synthesized. The synthesis of phosphine-protected alloy NCs of silver with varying gold doping and the superstructures of such systems are reported for the first time. These alloy clusters show aggregation-induced emission (AIE) property and form cluster-assembled spherical hollow superstructures in the presence of water without any template. The assembly of the alloy NCs within the hollow spheres leads to highly efficient emitting states.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Pravrati Taank, Riyanka Karmakar, K. V. Adarsh
Summary: The incomplete understanding of the exciton and free carrier recombination in the presence of defects is currently hindering the development of flexible and high-performance optoelectronic devices using transition metal dichalcogenide nanosheets. By studying few-layer MoS2 nanosheets, the recombination mechanism of excitons and free carriers was demonstrated through pump energy and fluence-dependent ultrafast transient absorption spectroscopy. The study revealed that excitons decay quickly within 3 ps due to the defect capture via the Shockley-Read-Hall mechanism, while free carriers show slower recombination (around 1000 ps).
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Physics, Applied
Vinod Kumar, Dipendranath Mandal, K. A. Sree Raj, Brahmananda Chakraborty, Amit Agarwal, Chandra S. Rout, K. V. Adarsh
Summary: An experimental observation of ultrafast third-order nonlinear optical response spanning the entire visible-to-near-infrared region in SWCNT-VSe2 nanohybrid is reported. The strong electronic coupling and efficient charge transfer in the nanohybrid result in unprecedented enhancements in nonlinear absorption and refraction. The nanohybrid also demonstrates superior performance as an optical limiter.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Arijit Jana, Wakeel Ahmed Dar, Sourav Kanti Jana, Ajay Kumar Poonia, Vivek Yadav, Jayoti Roy, Sourov Chandra, Kumaran Nair Valsala Devi Adarsh, Robin H. A. Ras, Thalappil Pradeep
Summary: This study presents an interesting light-activated expansion process of an Ag-31 nanocluster to an Ag-42 analogue, and provides evidence for the existence and mechanism of this process through experimental methods such as UV-vis spectroscopy and mass spectrometry.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Vinod Kumar, Sree Raj Afreen, K. A. Sree Raj, Pratap Mane, Brahmananda Chakraborty, Chandra S. Rout, K. V. Adarsh
Summary: Nonlinear optical phenomena play a crucial role in understanding microscopic light-matter interactions and have significant potential in various fields. By studying charge-coupled donor-acceptor materials, we demonstrate that the VSe2-rGO hybrid exhibits enhanced ultrafast nonlinear optical properties, leading to the development of a high-performance optical limiter device.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Applied
Ajay K. Poonia, Pushpendra Yadav, Barnali Mondal, Dipendranath Mandal, Pravrati Taank, Megha Shrivastava, Angshuman Nag, Amit Agarwal, K. V. Adarsh
Summary: We report the experimental observation of an electron-hole liquid (EHL) in a direct-band-gap perovskite-nanocrystal film at room temperature by exploiting the electron-phonon interaction. The helicity-resolved transient-absorption measurements reveal the EHL below the exciton and biexciton states. The condensation and evaporation times of the EHL are approximately 0.80 ps and approximately 60 ps, respectively. Our study offers opportunities for developing futuristic quantum technologies.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Debjani Karmakar, Manuel Pereiro, Md. Nur Hasan, Ritadip Bharati, Johan Hellsvik, Anna Delin, Samir Kumar Pal, Anders Bergman, Shivalika Sharma, Igor Di Marco, Patrik Thunstrom, Peter M. Oppeneer, Olle Eriksson
Summary: We have investigated the dynamic magnetic properties of V-based kagome stibnite compounds by combining magnetic parameters extracted from ab initio calculations with atomistic spin dynamics simulations. Our calculations show the existence of a complex magnetic landscape, including commensurate and incommensurate spin spirals, in addition to a ferromagnetic order. These chiral magnetic textures may be the key to understanding the observed inherent breaking of symmetry.
Article
Materials Science, Multidisciplinary
Megha Shrivastava, Abhijit Hazarika, J. Aneesh, Dipendranath Mandal, Matthew C. Beard, K. Adarsh
Summary: This study reports the first observation of giant spin-selective bandgap renormalization at room temperature and verifies this phenomenon through time-resolved circularly polarized femtosecond pump-probe spectroscopy. The findings open up new possibilities for optical manipulation of spin degrees of freedom and their many-body interactions in metal-halide perovskite nanocrystals for potential room-temperature applications.