@article{yamini_santos_fortulan_gazder_malhotra_vashaee_serhiienko_mori_2023, title={Room-Temperature Thermoelectric Performance of n-Type Multiphase Pseudobinary Bi2Te3-Bi2S3 Compounds: Synergic Effects of Phonon Scattering and Energy Filtering}, ISSN={["1944-8252"]}, DOI={10.1021/acsami.3c01956}, abstractNote={Bismuth telluride-based alloys possess the highest efficiencies for the low-temperature-range (<500 K) applications among thermoelectric materials. Despite significant advances in the efficiency of p-type Bi2Te3-based materials through engineering the electronic band structure by convergence of multiple bands, the n-type pair still suffers from poor efficiency due to a lower number of electron pockets near the conduction band edge than the valence band. To overcome the persistent low efficiency of n-type Bi2Te3-based materials, we have fabricated multiphase pseudobinary Bi2Te3–Bi2S3 compounds to take advantages of phonon scattering and energy filtering at interfaces, enhancing the efficiency of these materials. The energy barrier generated at the interface of the secondary phase of Bi14Te13S8 in the Bi2Te3 matrix resulted in a higher Seebeck coefficient and consequently a higher power factor in multiphase compounds than the single-phase alloys. This effect was combined with low thermal conductivity achieved through phonon scattering at the interfaces of finely structured multiphase compounds and resulted in a relatively high thermoelectric figure of merit of ∼0.7 over the 300–550 K temperature range for the multiphase sample of n-type Bi2Te2.75S0.25, double the efficiency of single-phase Bi2Te3. Our results inform an alternative alloy design to enhance the performance of thermoelectric materials.}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Yamini, Sima Aminorroaya and Santos, Rafael and Fortulan, Raphael and Gazder, Azdiar A. and Malhotra, Abhishek and Vashaee, Daryoosh and Serhiienko, Illia and Mori, Takao}, year={2023}, month={Apr} }
 @article{yamini_santos_fortulan_gazder_malhotra_vashaee_serhiienko_mori_2023, title={Room-Temperature Thermoelectric Performance of n-Type Multiphase Pseudobinary Bi2Te3-Bi2S3 Compounds: Synergic Effects of Phonon Scattering and Energy Filtering}, ISSN={["1944-8252"]}, DOI={10.1021/acsami.3c0195619220}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Yamini, Sima Aminorroaya and Santos, Rafael and Fortulan, Raphael and Gazder, Azdiar A. and Malhotra, Abhishek and Vashaee, Daryoosh and Serhiienko, Illia and Mori, Takao}, year={2023}, month={Apr} }
 @article{malhotra_hosseini_zaferani_hall_vashaee_2020, title={Enhancement of Diffusion, Densification and Solid-State Reactions in Dielectric Materials Due to Interfacial Interaction of Microwave Radiation: Theory and Experiment}, volume={12}, ISSN={["1944-8252"]}, DOI={10.1021/acsami.0c09719}, abstractNote={A detailed theoretical model and experimental study are presented that formulate and prove the existence of a robust ponderomotive force (PMF) near the interfaces in a granular dielectric material under microwave radiation. The model calculations show that the net direction of the PMF is pore angle-dependent. For most of the pore angles, the net force is towards the interface creating a mass transport that fills the interfacial pores and facilitates densification. For small ranges of angles, near 180o and 360o, PMF drives the ions in the reverse direction and depletes the pores. However, the net force for such ranges of angles is small. The PMF also enhances the diffusion of the mobile ionic species and, consequently, accelerates the solid-state reaction by increasing the collision probability. The proof-of-concept experiments show that a mixture of elemental powders can diffuse, react, and form dense materials when radiated by the microwave in just a few minutes. Such characteristics, together with field-induced decrystallization, offer a novel and simple approach for the synthesis of nanostructured compounds, which can have practical implications in ceramic technologies and thermoelectric materials.}, number={45}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Malhotra, Abhishek and Hosseini, Mahshid and Zaferani, Sadeq Hooshmand and Hall, Michael and Vashaee, Daryoosh}, year={2020}, month={Nov}, pages={50941–50952} }
 @misc{nozariasbmarz_collins_dsouza_polash_hosseini_hyland_liu_malhotra_ortiz_mohaddes_et al._2020, title={Review of wearable thermoelectric energy harvesting: From body temperature to electronic systems}, volume={258}, ISSN={["1872-9118"]}, url={https://publons.com/publon/30967440/}, DOI={10.1016/j.apenergy.2019.114069}, abstractNote={Global demand for battery-free metrics and health monitoring devices has urged leading research agencies and their subordinate centers to set human energy harvesting and self-powered wearable technologies as one of their primary research objectives. After an overview of wearables market trends, different active and passive methods of body energy harvesting for powering low-consumption electronic devices are introduced, and challenges of device fabrication are discussed. The discussion continues with the primary emphasis on thermoelectric generators for body heat harvesting. The physiological aspects of the human body involved in heat generation are elaborated. System requirements and the influence of different parameters on the performance of thermoelectric generators are studied at the material, device, and system levels. Finally, the advancements in the development of rigid and flexible thermoelectric generators for wearable and textile integration are presented.}, journal={APPLIED ENERGY}, author={Nozariasbmarz, Amin and Collins, Henry and Dsouza, Kelvin and Polash, Mobarak Hossain and Hosseini, Mahshid and Hyland, Melissa and Liu, Jie and Malhotra, Abhishek and Ortiz, Francisco Matos and Mohaddes, Farzad and et al.}, year={2020}, month={Jan} }
 @article{yao_myers_malhotra_lin_bozkurt_muth_zhu_2017, title={Hydration Sensing: A Wearable Hydration Sensor with Conformal Nanowire Electrodes (Adv. Healthcare Mater. 6/2017)}, volume={6}, ISSN={2192-2640}, url={http://dx.doi.org/10.1002/ADHM.201770031}, DOI={10.1002/adhm.201770031}, abstractNote={A wearable skin hydration sensor is developed by Y. Zhu, J. F. Muth, and co-workers in article number 1601159. The sensor is made of silver nanowires inlaid in a silicone substrate, which renders the sensor flexible and stretchable. Integrated systems with multimodal sensing capability (e.g., hydration, strain/motion and electrophysiological sensing) are demonstrated in two form factors — wristband and chest patch. Image design by Shanshan Yao.}, number={6}, journal={Advanced Healthcare Materials}, publisher={Wiley}, author={Yao, Shanshan and Myers, Amanda and Malhotra, Abhishek and Lin, Feiyan and Bozkurt, Alper and Muth, John F. and Zhu, Yong}, year={2017}, month={Mar} }
 @misc{nozariasbmarz_agarwal_coutant_hall_liu_liu_malhotra_norouzzadeh_oeztuerk_ramesh_et al._2017, title={Thermoelectric silicides: A review}, volume={56}, ISSN={["1347-4065"]}, url={http://dx.doi.org/10.7567/jjap.56.05da04}, DOI={10.7567/jjap.56.05da04}, abstractNote={Traditional research on thermoelectric materials focused on improving the figure-of-merit zT to enhance the energy conversion efficiency. With further growth and commercialization of thermoelectric technology beyond niche applications, other factors such as materials availability, toxicity, cost, recyclability, thermal stability, chemical and mechanical properties, and ease of fabrication become important for making viable technologies. Several silicide alloys were identified that have the potential to fulfill these requirements. These materials are of interest due to their abundancy in earth’s crust (e.g., silicon), non-toxicity, and good physical and chemical properties. In this paper, an overview of the silicide thermoelectrics from traditional alloys to advanced material structures is presented. In addition, some of the most effective approaches as well as fundamental physical concepts for designing and developing efficient thermoelectric materials are presented and future perspectives are discussed.}, number={5}, journal={JAPANESE JOURNAL OF APPLIED PHYSICS}, author={Nozariasbmarz, Amin and Agarwal, Aditi and Coutant, Zachary A. and Hall, Michael J. and Liu, Jie and Liu, Runze and Malhotra, Abhishek and Norouzzadeh, Payam and Oeztuerk, Mehmet C. and Ramesh, Viswanath P. and et al.}, year={2017}, month={May} }
 @inproceedings{lim_malhotra_mills_muth_lee_misra_2016, title={Metal oxide gas sensing characterization by low frequency noise spectroscopy}, DOI={10.1109/icsens.2016.7808835}, abstractNote={This work demonstrates a new method for selective identification of low ppb concentrations of O3. Atomic layer deposited thin film SnO2 was used as a sensing layer. SnO2 sensitized quartz crystal microbalances (QCM) demonstrate expected mass loading behavior as well as unique frequency domain response towards synthetic air, O3, and NO2 at room temperature. Power spectral densities (PSD) of the response of each gas were calculated and contain peaks at different normalized frequencies. These PSD peaks are found to have significant differences in magnitude for each analyte and provide evidence of selective room temperature adsorption of gases on SnO2.}, booktitle={2016 ieee sensors}, author={Lim, M. and Malhotra, A. and Mills, S. and Muth, J. and Lee, B. and Misra, Veena}, year={2016} }