Glass‐Like Thermal Conductivity of (010)‐Textured Lanthanum‐Doped Strontium Niobate Synthesized with Wet Chemical Deposition

Foley, Brian M.; Brown-Shaklee, Harlan James; Campion, Michael J.; Medlin, Douglas L.; Ihlefeld, Jon F.; Hopkins, Patrick E.

doi:10.1111/jace.13318

Cited by 6 publications

(5 citation statements)

References 51 publications

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“…Boyu Zhang et al, 48 has reported z E-mail: smchen78@ms15.hinet.net; smchen1957@gmail.com Nb-doped SrTiO 3 for thermoelectric performance study, Di Chen, and Jinhua Ye., 49 synthesized Sr 2 Nb 2 O 7 nanoribbon and SrNb 2 O 6 nanorod for the effective water-splitting reaction. Brian M. Foley et al, 50 have prepared lanthanum doped strontium niobate with wet chemical deposition. Moreover, strontium-niobium engulfed with reduced graphene oxide is not investigated in the field of electrochemical sensors.…”

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confidence: 99%

Interfacial Influence of Strontium Niobium Engulfed Reduced Graphene Oxide Composite for Sulfamethazine Detection: Employing an Electrochemical Route in Real Samples

Nataraj

Balasubramanian

2021

J. Electrochem. Soc.

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Sulfonamides are a broad assortment of drugs utilized in treating bacterial diseases in veterinary and human existence as anti-infection agents. The escalating usage of such medications requires explicit recognition. This work describes the electrochemical detection of sulfamethazine (SMZ) (a subgroup of sulfonamides) using strontium niobium combined with reduced graphene oxide (SN/rGO) as composite material. The structural and topological criteria illustrate the surface immaculateness and elemental presence of the crystalline material SN/rGO with XRD and FE-SEM analysis. Additional examinations of chemical states and the functional group were identified with XPS and FT-IR measurements. The feasibility of the sensor was inspected in the record of electrochemical studies. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) studies have demonstrated the effective implementation of the fabricated sensor with facilitating higher electroactive sites and enhanced conductance with SN/rGO. The amalgamation of SN and rGO has substantial influence with a lower limit of detection 6 nM with linearity from 0.009 μM to 128 μM. The limit of quantification was about 0.0224 μM. The specific detection acquired over anti-interference studies and real-world actualize over milk, honey, and human blood serum tests mirror SN/rGO modified platform’s viable capability. The construction of SN/rGO is envisioned as a promising dais for improved SMZ sensing in real samples.

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mentioning

confidence: 99%

Interfacial Influence of Strontium Niobium Engulfed Reduced Graphene Oxide Composite for Sulfamethazine Detection: Employing an Electrochemical Route in Real Samples

Nataraj

Balasubramanian

2021

J. Electrochem. Soc.

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“…TDTR is uniquely well equipped to measure thin film systems, allowing for experimental validation of the thermal impact of novel architectures and additional complexities. In our group, we have used TDTR to measure transport in complex oxide systems ranging from layered single crystal systems [93] to nano-grained thin films [94,95] and many more. As all of the materials being analyzed in this dissertation involve nanometer size scales (or in the case of the TiO 2 , will be used to eventually analyze thermal transport in materials with nanoscale layering), the functional oxide thermal characterization technique that I use is TDTR.…”

Section: Thermal Transport In Functional Oxidesmentioning

confidence: 99%

“…In this vain, a course of investigation for new thermal barrier coating materials lies in exploration of oxides with very complex crystal structures that will reduce phonon transport to an amorphous limit [68,93,110]. Additionally, investigations into adding phonon scattering mechanisms such as nano-scale boundaries have led to considering a variety of deposition techniques and materials [51,111].…”

Section: Functional Oxide Applications In Thermal Insulationmentioning

confidence: 99%

Understanding Phonon Interactions with Defects in Functional Oxide Materials

Donovan¹

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Understanding of nano-scale thermal transport has enabled significant advances in a wide variety of fields including microelectronics, alternative energy, optics, and many more [1][2][3][4]. Utilized in many of these applications are a class of materials known as functional oxides. These materials are oxygen compounds with specific functional properties of interest (e.g., dielectrics [5][6][7][8], piezoelectrics [9][10][11], photovoltaics [12][13][14], thermoelectrics [15][16][17][18][19]). Often it is the defects in these materials that enable functionality and, depending on the processing and operating conditions, the concentration and types of defects that are present in these materials can vary widely [20]. In this dissertation, I aim to identify the role that defects play in functional oxide materials with respect to thermal transport.The major thermal carriers in most functional oxide crystals are collective lattice vibrations, or phonons [21]. Phonon-dominated thermal conductivity is dictated by the scattering of these thermal carriers with a variety of other components or the material system, including defects in the crystal [22,23]. I concentrate on three types of defects that are common in functional oxides: boundaries, extrinsic point defects, and intrinsic point defects.Boundaries such as film boundaries and grain boundaries with nano-scale dimensions can be detrimental to the thermal conductivity of a material. As the length of the uninterrupted crystal reduces to the phonon mean free paths in the crystal, phonons will scatter readily off of nano-scale boundaries and will not be able to propagate as they would in a bulk environment. This becomes particularly relevant in technologies such as the microelectronics industry, where device size scales are well below common phonon mean free paths in the constituent materials. To study this, I turn to one of the more common functional oxides used in the microelectronics industry, BaTiO 3 .I study the effects of nano-scale grains on thin films of BaTiO 3 grown via chemical solution deposition. The films studied are 150 nm and range in grain size from 36 nm -63 nm. I show that the thermal conductivity of these nano-grained films scales with the grain size and film thickness and demonstrate agreement of this trend with analytical models. This result demonstrates that despite a complex crystal structure, there is a mean free path spectrum of phonons in BaTiO 3 that significantly exceeds the dimensions of the grains and film (contrary to the common "gray" mean 2 free path assumption seen in literature).To address the role of extrinsic point defects, or dopants, on the thermal conductivity of functional oxides, I study the effects of dysprosium doping in thin films of cadmium oxide deposited by molecular beam epitaxy. In this experiment, the addition of Dy dopants in CdO actually increases the thermal conductivity initially, owing to a reduction in the equilibrium concentration of oxygen vacancies (a type of defect that is intrinsic to all oxides). The de...

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“…The image on the right shows a higher magnification of a section of the grain overlaid with 101 projections of the Sr (yellow) and Nb (orange) atom positions in the Sr 2 Nb 2 O 7 (n = 4 NbO 6 octahedra) and Sr 5 Nb 5 O 17 (n = 5 NbO 6 octahedra) crystal structures. [9] . .…”

Section: Acknowledgementsmentioning

confidence: 99%

“…Where the works on nano grained SrTiO 3 and BaTiO 3 focused on the impact of incoherent grain boundaries, research on naturally-layered strontium niobate (Sr 2 Nb 2 O 7 ) [9] demonstrated that changes in local strain and bonding where crystalline coherence is maintained can have a dramatic effect on phonon transport within these materials. The importance of this is the fact that the ability to create phonon scattering sites while maintaining the periodicity of the crystal lattice is an important step towards the electron-crystal/phonon-glass material criteria that is the ultimate goal for high-efficiency thermoelectrics.…”

Section: Coherent Interfaces: Srmentioning

confidence: 99%

Dynamic Control of Thermal Transport via Phonon Scattering at Ferroelastic Domain Walls

Foley

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The memories and moments that I've shared with all of you during my time in Charlottesville will be cherished for the rest of my life. A special thanks to all of my friends outside of Charlottesville that have lent their support from afar; the Gregoires, the Hardimans, the Foleys, the DeParis, the Donovans, the Brusos, the Mattons, Laura Day, Aleena Bando and the rest of the Worcester Homeloaf. Additionally, a huge thank you to my good friend and fellow WPI alumnus, Hans Jensen. Last but certainly not least, I would like to thank my amazing family and girlfriend, Caitlin, for all of the love and support that you have provided. To my parents, Jack and Robin: thank you for always being there for me both in good times and in bad, and for molding me into the man that I am today. I love you both so much and am so very proud to be your son. To my sisters, Lindsay and Mara: you are both so important to me and your love and support motivates me to be the best big brother that I possibly can. The three of us make a great team and I love you both so very much. To my extended family, all the Foleys, Mouchons and Collins: thank you all for all your love and support throughout my life. And to my girlfriend, Caitlin: words can hardly express how much I appreciate you being by my side and supporting me over the past seven years, especially the last five during my PhD. I love you so very, very much and look forward to our next adventure together! iii Contents Acknowledgements i cive field (±E c), saturation polarization (±P sat) and remanent polarization (±P r). Arrows indicate the progression of the applied electric field, sweeping from zero field to maximum positive field, then maximum negative field, and then back to zero field.

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Glass‐Like Thermal Conductivity of (010)‐Textured Lanthanum‐Doped Strontium Niobate Synthesized with Wet Chemical Deposition

Cited by 6 publications

References 51 publications

Interfacial Influence of Strontium Niobium Engulfed Reduced Graphene Oxide Composite for Sulfamethazine Detection: Employing an Electrochemical Route in Real Samples

Interfacial Influence of Strontium Niobium Engulfed Reduced Graphene Oxide Composite for Sulfamethazine Detection: Employing an Electrochemical Route in Real Samples

Understanding Phonon Interactions with Defects in Functional Oxide Materials

Dynamic Control of Thermal Transport via Phonon Scattering at Ferroelastic Domain Walls

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