@inbook{patil_sharath_halse_saraswathi_murgunde_joshi_kalasad_2024, title={Elemental semiconductor nanocrystals}, url={http://dx.doi.org/10.1016/b978-0-323-96125-7.00025-3}, DOI={10.1016/b978-0-323-96125-7.00025-3}, abstractNote={Semiconductor nanocrystals are one of the most studied nanoscale materials during the last three decades due to their size-dependent physical and chemical properties. These semiconductor nanocrystals are a unique collection of materials that have narrow excitation bands, size tunable, high quantum yield, broad absorption profiles, photochemical stability, and symmetric emission spectra. In this chapter, a review on basics of semiconductor nanocrystals, size and surface effects, quantum dots, and different elemental semiconductor nanocrystals is provided. The detailed illustration about fundamental properties, synthesis, functionalization, controlling different size and shape with various applications of elemental semiconductor nanocrystals is provided.}, booktitle={Handbook of Emerging Materials for Sustainable Energy}, publisher={Elsevier}, author={Patil, Vismitha S. and Sharath, S.C. and Halse, S.V. and Saraswathi, B. and Murgunde, B.K. and Joshi, Naveen N. and Kalasad, M.N.}, year={2024}, month={Jan}, pages={825–851} }
 @article{shukla_khanna_sahoo_joshi_narayan_2024, title={Nanomaterial-Coated Carbon-Fiber-Based Multicontact Array Sensors for In Vitro Monitoring of Serotonin Levels}, volume={7}, ISSN={["2576-6422"]}, url={http://dx.doi.org/10.1021/acsabm.3c01089}, DOI={10.1021/acsabm.3c01089}, abstractNote={In this study, we demonstrated the fabrication of multicontact hierarchical probes for the in vitro detection of serotonin levels. The basic three-dimensional (3D) bendable prototypes with 3 (C1), 6 (C2), or 9 (C3) contact surfaces were printed from polymeric resin via the digital light processing (DLP) technique. We chose ultrasonicated carbon fiber strands to transform these designs into multicontact carbon fiber electrodes (MCCFEs). The exposed carbon fiber (CF) surfaces were modified with aminopropyl alkoxysilane (APTMS), followed by the subsequent loading of palladium nanoclusters (PdNPs) to build active recording sites. CF functionalization with PdNPs was achieved by the wet chemical reduction of Pd(II) to Pd(0). The MCCFE configurations demonstrated an enhancement in the electroactive surface area and an improved voltammetric response toward 5-HT oxidation by increasing the points of the contacts (i.e., from C1 to C3). These MCCFEs are comparable to 3D-protruding electrodes as they can enable multipoint analyte detection. Along with the electrode patterns, morphological irregularities associated with both Pd-doped and undoped CFs supported the creation of proximal diffusion layers for facile mass transfer. Low detection limits of 0.8-10 nM over a wide concentration range, from 0.005 nM to 1 mM, were demonstrated. The MCCFE sensors had a relatively low standard deviation value of ∼2%. This type of sensitive and cost-effective electrochemical sensor may prove useful for collecting electrical impulses and long-term monitoring of 5-HT in vivo in addition to in vitro testing.}, number={1}, journal={ACS APPLIED BIO MATERIALS}, author={Shukla, Shubhangi and Khanna, Sumeer and Sahoo, Siba and Joshi, Naveen and Narayan, Roger}, year={2024}, month={Jan}, pages={472–484} }
 @article{joshi_shukla_khosla_vanderwal_stafslien_narayan_narayan_2024, title={Q-carbon as an emergent surface coating material for antimicrobial applications}, volume={791}, ISSN={["1879-2731"]}, url={https://doi.org/10.1016/j.tsf.2024.140227}, DOI={10.1016/j.tsf.2024.140227}, abstractNote={Q-carbon, an allotrope of carbon, exhibits exciting functional properties and robust mechanical strength. We propose that the surface of the Q-carbon can be functionalized by doping it with silicon to enhance its performance as a potential implant material. As such, a coating of silicon-doped Q-carbon (Si-Q-carbon) is shown to minimize the formation of biofilm, thus reducing the risk of microbial infection. We report the formation of Si-Q-carbon coatings of varied thicknesses (10 nm and 20 nm) through the plasma-enhanced chemical vapor deposition technique. The surface composition and the bonding characteristics of the thin films were evaluated by Raman spectroscopy, XPS, and EELS studies, which showed that the thinnest sample (10 nm) has a high sp3 content of ∼85%. Furthermore, wettability and surface energy calculations were undertaken to investigate the surface characteristics of the coatings. The 10 nm sample was found to be more hydrophilic with a water contact angle of 75.3° (± 0.6°). The antibacterial activity of Si-Q-carbon coatings was investigated using a Staphylococcus epidermidis agar plating technique, and the adhesion of bacteria was explained in terms of the surface properties of the thin films. We demonstrate that the Si-Q-carbon coating with the highest sp3 content is hydrophilic and showed a 57% reduction in adhered biofilm relative to a glass control. We envisage the potential application of Q-carbon in arthroplasty devices with enhanced mechanical strength and resistance to periprosthetic joint infections.}, journal={THIN SOLID FILMS}, author={Joshi, Naveen and Shukla, Shubhangi and Khosla, Nayna and Vanderwal, Lyndsi and Stafslien, Shane and Narayan, Jagdish and Narayan, Roger J.}, year={2024}, month={Feb} }
 @article{joshi_machekposhti_narayan_2023, title={Evolution of Transdermal Drug Delivery Devices and Novel Microneedle Technologies: A Historical Perspective and Review}, volume={3}, url={https://doi.org/10.1016/j.xjidi.2023.100225}, DOI={10.1016/j.xjidi.2023.100225}, abstractNote={The history of transdermal drug delivery is as old as humankind. Transdermal drug delivery has undergone three generations of development; the third generation has involved the use of medical devices and instruments. This review provides a historical perspective on the primary approaches employed in the three generations of transdermal drug delivery. In addition, we explore some of the recently developed transdermal techniques that are deemed promising in the field of drug delivery. We discuss how advances in these techniques have led to the development of devices for the delivery of a therapeutically effective amount of drug across human skin and highlight the limitations of the first- and second-generation drug delivery tools. As such, a review of the performance of these techniques and the toxicity of the devices used in transdermal drug delivery are considered. In the last section of the review, a discussion of the fabrication and operation of different types of microneedles is presented. The applications of microneedles in the sensing and delivery of various therapeutic agents are described in detail. Furthermore, an overview of the efficacy of microneedles as emerging tools for the controlled release of drugs is presented.}, number={6}, journal={JID Innovations}, author={Joshi, Naveen and Machekposhti, Sina Azizi and Narayan, Roger J.}, year={2023}, month={Nov} }
 @article{shukla_machekposhti_joshi_joshi_narayan_2023, title={Microneedle-Integrated Device for Transdermal Sampling and Analyses of Targeted Biomarkers}, volume={4}, ISSN={["2688-4046"]}, url={http://dx.doi.org/10.1002/smsc.202200087}, DOI={10.1002/smsc.202200087}, abstractNote={Currently available point‐of‐care systems for body fluid collection exhibit poor integration with sensors. Herein, the design of a disposable device for interstitial fluid (ISF) extraction as well as glucose, lactate, and potassium ion (K+) monitoring is reported on. It is minimally invasive and appropriate for single use, minimizing the risk of infection to the user. This microscale device contains a 3D‐printed cap‐like structure with a four‐by‐four microneedle (MN) array, bioreceptor‐modified carbon fiber (CF)‐sensing surface, and negative pressure convection technology. These features are incorporated within a compact, self‐contained, and manually operated microscale device, which is capable of withdrawing ≈3.0 μL of ISF from the skin. MN arrays applied with an upward driving force may increase the ISF flow rate. Moreover, functionalized CF working electrodes (WE1, WE2, WE3) are shown to selectively detect lactate, glucose, and K+ with high sensitivities of 0.258, 0.549, and 0.657 μA μm−1 cm−2 and low detection limits of 0.01, 0.080, 0.05 μm, respectively. Ex vivo testing on porcine skin is used to detect the ISF levels of the biomarkers. The microscale device can be a replacement for current point‐of‐care diagnostic approaches.}, number={6}, journal={SMALL SCIENCE}, publisher={Wiley}, author={Shukla, Shubhangi and Machekposhti, Sina Azizi and Joshi, Naveen and Joshi, Pratik and Narayan, Roger J.}, year={2023}, month={Apr} }
 @article{kadian_chaulagain_joshi_alam_cui_shankar_manik_narayan_2023, title={Probe sonication-assisted rapid synthesis of highly fluorescent sulfur quantum dots}, volume={34}, ISSN={["1361-6528"]}, url={http://dx.doi.org/10.1088/1361-6528/acd00a}, DOI={10.1088/1361-6528/acd00a}, abstractNote={Abstract}, number={30}, journal={NANOTECHNOLOGY}, publisher={IOP Publishing}, author={Kadian, Sachin and Chaulagain, Narendra and Joshi, Naveen Narasimhachar and Alam, Kazi M. and Cui, Kai and Shankar, Karthik and Manik, Gaurav and Narayan, Roger J.}, year={2023}, month={Jul} }
 @article{joshi_shukla_khosla_vanderwal_stafslien_narayan_narayan_2023, title={Q-Carbon as an Emergent Surface Coating Material for Antimicrobial Applications}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85162676028&partnerID=MN8TOARS}, DOI={10.2139/ssrn.4467042}, abstractNote={Q-carbon is a newly discovered allotrope of carbon that exhibits unique functional properties and robust mechanical strength. We propose that the surface of the Q-carbon can be functionalized by doping it with silicon to enhance its performance as a potential implant material. As such, a coating of silicon-doped Q-carbon (Si-Q-carbon) is shown to minimize the formation of biofilm, thus reducing the risk of microbial infection. Here in, we report the formation of Si-Q-carbon coatings of varied thicknesses (10 nm and 20 nm) through the plasma-enhanced chemical vapor deposition (PECVD) technique. The surface composition and the bonding characteristics of the thin films were evaluated by Raman and XPS analysis and showed that the thinnest sample (10 nm) has high sp3 content with an ID/IG ratio of 0.11. Furthermore, wettability and surface energy calculations were undertaken to investigate the surface characteristics of the coatings. The 10 nm sample was found to be more hydrophilic with a water contact angle of 75.3 ± 0.64°. The antibacterial activity of Si-Q-carbon coatings was investigated using a Staphylococcus epidermidis agar plating technique and the adhesion of bacteria was explained in terms of the surface properties of the thin films. We demonstrate that the Si-Q-carbon coating with the highest sp3 content is hydrophilic and showed a 57% reduction in adhered biofilm relative to a glass control. We envisage the potential application of Q-carbon in arthroplasty devices with enhanced mechanical strength and resistance to periprosthetic joint infections (PJIs).}, journal={SSRN}, publisher={Elsevier BV}, author={Joshi, Naveen Narasimhachar and Shukla, Shubhangi and Khosla, Nayna and Vanderwal, Lyndsi and Stafslien, Shane and Narayan, J. and Narayan, Roger}, year={2023} }
 @article{joshi_shivashankar_narayan_2023, title={Surfactant-free synthesis and magnetic property evaluation of air-stable cobalt oxide nanostructures}, volume={4}, ISSN={["2632-959X"]}, url={https://doi.org/10.1088/2632-959X/acf4ae}, DOI={10.1088/2632-959X/acf4ae}, abstractNote={Abstract}, number={3}, journal={NANO EXPRESS}, author={Joshi, Naveen and Shivashankar, S. A. and Narayan, Roger}, year={2023}, month={Sep} }
 @article{narayan_sahoo_joshi_narayan_2023, title={Synthesis and novel properties of Q-silicon (January 2023)}, volume={11}, ISSN={["2166-3831"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85163376006&partnerID=MN8TOARS}, DOI={10.1080/21663831.2023.2224396}, abstractNote={We report the discovery of Q-silicon with an atomic density of 60% higher than crystalline silicon while keeping the bonding characteristics the same as normal silicon. Distinct amorphous phases are created, when one, two, or three tetrahedra are randomly packed, and a crystalline phase of Q-silicon is formed when subunit cells are arranged along <110> directions with alternate holes. Nanosecond laser melting of amorphous silicon in an undercooled state and quenching have created Q-silicon with robust ferromagnetism compared to the diamagnetism of silicon. The blocking temperature of Q-silicon is estimated to be over 400 K, thus opening a new frontier for spin-based computing and atomic-level storage. GRAPHICAL ABSTRACT IMPACT STATEMENT The discovery of Q-silicon having robust RT ferromagnetism will open a new frontier in atomic-scale spin-based devices and functional integration with nanoelectronics. Other properties of interest include enhanced hardness and superconductivity.}, number={8}, journal={MATERIALS RESEARCH LETTERS}, publisher={Informa UK Limited}, author={Narayan, Jagdish and Sahoo, Siba Sundar and Joshi, Naveen and Narayan, Roger}, year={2023}, month={Aug}, pages={688–696} }
 @article{joshi_shukla_gupta_joshi_narayan_narayan_2023, title={Synthesis of laser-patterned MoS2 nanoneedles for advanced electrochemical sensing}, volume={6}, ISSN={["2159-6867"]}, url={http://dx.doi.org/10.1557/s43579-023-00381-y}, DOI={10.1557/s43579-023-00381-y}, abstractNote={We describe a novel excimer laser-based route for the fabrication of crystalline MoS2 nanoneedles. Laser annealing of MoS2 thin films at a low energy density of 0.08 Jcm−2 resulted in a closed-pack structure with low defects and excellent conductivity due to melting and rapid quenching. A further increase in laser annealing energy density resulted in the formation of MoS2 nano-needles. This structure of MoS2 was found to have a remarkable reduction ability for H2O2 at − 0.14 V over a wide linear range; a low detection limit (0.45 nM (S/N = 3)) and sensitivity of 2.38 μA/mM cm−2 were demonstrated.}, number={4}, journal={MRS COMMUNICATIONS}, publisher={Springer Science and Business Media LLC}, author={Joshi, Pratik and Shukla, Shubhangi and Gupta, Siddharth and Joshi, Naveen and Narayan, Jagdish and Narayan, Roger}, year={2023}, month={Jun} }
 @article{joshi_shukla_narayan_2022, title={Novel photonic methods for diagnosis of
            <scp>SARS‐CoV</scp>
            ‐2 infection}, volume={4}, url={http://dx.doi.org/10.1002/tbio.202200001}, DOI={10.1002/tbio.202200001}, abstractNote={Abstract}, number={1-2}, journal={Translational Biophotonics}, publisher={Wiley}, author={Joshi, Naveen and Shukla, Shubhangi and Narayan, Roger}, year={2022}, month={Mar} }