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  1. Article ; Online: Enhanced piezoelectric response in BTO NWs-PVDF composite through tuning of polar phase content.

    Hazra, Snehamoyee / Ghatak, Ankita / Ghosh, Arnab / Sengupta, Subhamita / Raychaudhuri, A K / Ghosh, Barnali

    Nanotechnology

    2022  Volume 34, Issue 4

    Abstract: We have fabricated a flexible, environment friendly piezoelectric nanogenerator (PENG) based on the ferroelectric Polyvinylidene fluoride (PVDF) composite incorporated with Barium titanate ( ... ...

    Abstract We have fabricated a flexible, environment friendly piezoelectric nanogenerator (PENG) based on the ferroelectric Polyvinylidene fluoride (PVDF) composite incorporated with Barium titanate (BaTiO
    Language English
    Publishing date 2022-11-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ac9d41
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  2. Article ; Online: Piezoelectric Nanogenerators based on Lead Zirconate Titanate nanostructures: an insight into the effect of potential barrier and morphology on the output power generation.

    Hazra, Snehamoyee / Sengupta, Subhamita / Ratha, Soumyaranjan / Ghatak, Ankita / Raychaudhuri, A K / Ghosh, Barnali

    Nanotechnology

    2022  Volume 33, Issue 15

    Abstract: The high internal resistance of the perovskite materials used in Nanogenerators (NGs) lowers the power generation. It severely restricts their application for mechanical energy harvesting from the ambient source. In this work, we demonstrate a flexible ... ...

    Abstract The high internal resistance of the perovskite materials used in Nanogenerators (NGs) lowers the power generation. It severely restricts their application for mechanical energy harvesting from the ambient source. In this work, we demonstrate a flexible Piezoelectric NG (PENG) with an improved device structure. Hydrothermally grown one-dimensional Lead Zirconate Titanate (Pb(ZrTi)O
    Language English
    Publishing date 2022-01-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ac4739
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  3. Article ; Online: ZnO/Si nanowires heterojunction array-based nitric oxide (NO) gas sensor with noise-limited detectivity approaching 10 ppb.

    Samanta, Chandan / Ghatak, Ankita / Raychaudhuri, A K / Ghosh, Barnali

    Nanotechnology

    2019  Volume 30, Issue 30, Page(s) 305501

    Abstract: We report a ZnO/Silicon nanowire (ZnO/Si NWs) heterojunction array-based NO gas sensor operating at room temperature with an extremely high response (noise limited response ∼10 ppb). The sensor shows very high selectivity towards NO gas sensing and ... ...

    Abstract We report a ZnO/Silicon nanowire (ZnO/Si NWs) heterojunction array-based NO gas sensor operating at room temperature with an extremely high response (noise limited response ∼10 ppb). The sensor shows very high selectivity towards NO gas sensing and limited perturbation in response due to the presence of moisture. The sensor has been fabricated by using cost-effective chemical processing that is compatible with wafer-level processing. The vertically aligned Si NWs array has been made by an electroless etching method and the ZnO nanostructure was made by chemical solution deposition and spin-coating. Extensive cross-sectional electron microscopy and composition analysis by line EDS allowed us to make a physical model. The electrical characteristic of the model was to fit the I-V data before and after exposure to gas and essential changes in electrical parameters were obtained. This was then explained based on a proposal for the mechanism of gas sensing. We observe that the heterostructure leads to a synergetic effect where the sensing response is more than the sum total of the individual components, namely the ZnO and the Si NWs. The response is much enhanced in the p-n junction when the n-ZnO nanostructure interfaces with p-Si NW compared to that in the n-n junction formed by ZnO on n-Si NW.
    Language English
    Publishing date 2019-03-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ab10f8
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  4. Article: Pulsed laser assisted growth of aligned nanowires of WO3: role of interface with substrate

    Ghatak, Ankita / Roy Moulik, Samik / Ghosh, Barnali

    RSC advances. 2016 Mar. 29, v. 6, no. 38

    2016  

    Abstract: We report here a systematic study of the growth of aligned WO3 (002)-oriented nanowires (NWs) on a (111)-oriented platinised silicon substrate using a pulsed laser deposition (PLD) method. Transmission electron microscopy (TEM) analysis has shown that ... ...

    Abstract We report here a systematic study of the growth of aligned WO3 (002)-oriented nanowires (NWs) on a (111)-oriented platinised silicon substrate using a pulsed laser deposition (PLD) method. Transmission electron microscopy (TEM) analysis has shown that the wires are single crystalline and grow along the [001]t or [100]t directions. X-ray diffraction (XRD) measurements confirm phase and structural analysis. We investigated the effect of ablated particle flux on nanowire growth, in particular, the role of the nucleating centre at the interface as it gets modified by the ablated particle flux. We observe a critical value of the laser energy (that determines a critical flux and energy of ablated moieties) at which a compact nanograin film gets converted to an aligned nanowire film. We attribute the existence of such a threshold to the desorption process from the catalyst droplet. By cross-sectional TEM and compositional mapping accompanied by simulation, we confirm that the interfacial layer between the substrate and NW is modified by the ablated particle flux and energy. Aligned NWs above the threshold energy can be attributed to the formation of favorable nucleation sites for a preferred orientation.
    Keywords X-ray diffraction ; catalysts ; desorption ; droplets ; energy ; moieties ; nanowires ; silicon ; transmission electron microscopy ; tungsten oxide
    Language English
    Dates of publication 2016-0329
    Size p. 31705-31716.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c5ra27542c
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Design of a self-powered triboelectric face mask.

    Ghatak, Barnali / Banerjee, Sanjoy / Ali, Sk Babar / Bandyopadhyay, Rajib / Das, Nityananda / Mandal, Dipankar / Tudu, Bipan

    Nano energy

    2020  Volume 79, Page(s) 105387

    Abstract: Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes ...

    Abstract Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes a face mask in which a simple triboelectric nanogenerator (TENG) with an electrocution layer may serve the purpose of filtration and deactivation of SARS-CoV-2. The proposed mask is designed with multilayer filters, in which the inner three layers act as a triboelectric (TE) filter and the outer one as an electrocution layer (EL). The viral particles experience a mildshock in EL due to the electric field produced between the electrocution layers by contact electrification. Four pairs of triboelectric series fabrics, i.e. polyvinylchloride (PVC)-nylon, polypropylene (PP)-polyurethane (PU), latex rubber-PU, polyimide (PI)-nylon are studied to establish the efficacy of the mask. The motional force exerted on triboelectric filter materials can produce sufficient electric power to activate EL. The proposed mask can be used by a wide range of people because of its triboelectric self-powering (harvesting mechanical energy from daily activities, e.g. breathing, talking or other facial movements) functionalities to ensure effective filtration efficiency. More importantly, it is expected to be potentially beneficial to slow down the devastating impact of COVID-19.
    Keywords covid19
    Language English
    Publishing date 2020-09-20
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2211-2855
    ISSN 2211-2855
    DOI 10.1016/j.nanoen.2020.105387
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Manganite (La[Formula: see text]A[Formula: see text]MnO[Formula: see text]; A = Sr, Ca) nanowires with adaptable stoichiometry grown by hydrothermal method: understanding of growth mechanism using spatially resolved techniques

    Datta, Subarna / Ankita Ghatak / Barnali Ghosh

    Journal of materials science. 2016 Nov., v. 51, no. 21

    2016  

    Abstract: We report an investigation to understand the basic growth mechanism of family of perovskite oxide manganite of La[Formula: see text]A[Formula: see text]MnO[Formula: see text] (where A = Ca, Sr; x = 0.3 and 0.5) nanostructures in cost-effective ... ...

    Abstract We report an investigation to understand the basic growth mechanism of family of perovskite oxide manganite of La[Formula: see text]A[Formula: see text]MnO[Formula: see text] (where A = Ca, Sr; x = 0.3 and 0.5) nanostructures in cost-effective hydrothermal route, which adds a new dimension in the low-temperature range (230–300 °C) synthesis route of complex oxide system. We adapt size, shape, and composition control issues in different doping regimes by means of a simple common synthesis route and tuning the ground state property of nanostructures of complex oxide manganite system. The general principle of growth of nanocrystals and its controllable length scale tailoring are explained and most importantly, how the amount of mineralizer tunes the shape and size of the nanostructures has been discussed. Mechanism of shape and size tuning followed by a phase diagram has been proposed. The quality of the grown nanowires was confirmed by the number of physical property studies, both in ensemble and single nanowire level, using spatially resolved tools and techniques. Understanding of detailed interaction mechanisms of perovskite oxide manganite is definitely promising for rationally designing various kinds of inorganic materials in controllable length scale via wet chemistry route.
    Keywords calcium ; cost effectiveness ; lanthanum ; manganese ; nanocrystals ; nanowires ; stoichiometry ; strontium
    Language English
    Dates of publication 2016-11
    Size p. 9679-9695.
    Publishing place Springer US
    Document type Article
    ZDB-ID 2015305-3
    ISSN 1573-4803 ; 0022-2461
    ISSN (online) 1573-4803
    ISSN 0022-2461
    DOI 10.1007/s10853-016-0201-4
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Design of a Self-powered Smart Mask for COVID-19

    Ghatak, Barnali / Banerjee, Sanjoy / Ali, Sk Babar / Bandyopadhyay, Rajib / Das, Nityananda / Mandal, Dipankar / Tudu, Bipan

    Abstract: Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes ...

    Abstract Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes a face mask in which a simple textile triboelectric nanogenerator (TENG) serves the purpose of filtration of SARS-CoV-2. The proposed mask is designed with multilayer protection sheets, in which the first two layers act as triboelectric (TE) filter and the outer one is a smart filter. The conjugated effect of contact electrification, and electrostatic induction of the proposed smart mask are effective in inactivating the span of virus-ladden aerosols in a bidirectional way. Five pairs of triboseries fabrics i.e. nylon - polyester, cotton - polyester, poly(methyl methacrylate) - PVDF, lylon - PVDF and polypropylene - polyester have been optimized in this study in terms of their effective tribo-electric charge densities as 83.13, 211.48, 38.62, 69 and 74.25 nC/m2, respectively. This smart mask can be used by a wide range of people because of its simple mechanism, self-driven (harvesting mechanical energy from daily activities, e.g. breathing, talking, or other facial movements functionalities, and effective filtration efficiency and thus, it is expected to be potentially beneficial to slow down the devastating impact of COVID-19.
    Keywords covid19
    Publisher ArXiv
    Document type Article
    Database COVID19

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  8. Article: Design of a self-powered triboelectric face mask

    Ghatak, Barnali / Banerjee, Sanjoy / Ali, Sk Babar / Bandyopadhyay, Rajib / Das, Nityananda / Mandal, Dipankar / Tudu, Bipan

    Nano Energy

    Abstract: Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes ...

    Abstract Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes a face mask in which a simple triboelectric nanogenerator (TENG) with an electrocution layer may serve the purpose of filtration and deactivation of SARS-CoV-2. The proposed mask is designed with multilayer filters, in which the inner three layers act as a triboelectric (TE) filter and the outer one as an electrocution layer (EL). The viral particles experience a mildshock in EL due to the electric field produced between the electrocution layers by contact electrification. Four pairs of triboelectric series fabrics, i.e. polyvinylchloride (PVC)-nylon, polypropylene (PP)-polyurethane (PU), latex rubber-PU, polyimide (PI)-nylon are studied to establish the efficacy of the mask. The motional force exerted on triboelectric filter materials can produce sufficient electric power to activate EL. The proposed mask can be used by a wide range of people because of its triboelectric self-powering (harvesting mechanical energy from daily activities, e.g. breathing, talking or other facial movements) functionalities to ensure effective filtration efficiency. More importantly, it is expected to be potentially beneficial to slow down the devastating impact of COVID-19.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #779473
    Database COVID19

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  9. Book ; Online: Design of a Self-powered Smart Mask for COVID-19

    Ghatak, Barnali / Banerjee, Sanjoy / Ali, Sk Babar / Bandyopadhyay, Rajib / Das, Nityananda / Mandal, Dipankar / Tudu, Bipan

    2020  

    Abstract: Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes ...

    Abstract Usage of a face mask has become mandatory in many countries after the outbreak of SARS-CoV-2, and its usefulness in combating the pandemic is a proven fact. There have been many advancements in the design of a face mask and the present treatise describes a face mask in which a simple textile triboelectric nanogenerator (TENG) serves the purpose of filtration of SARS-CoV-2. The proposed mask is designed with multilayer protection sheets, in which the first two layers act as triboelectric (TE) filter and the outer one is a smart filter. The conjugated effect of contact electrification, and electrostatic induction of the proposed smart mask are effective in inactivating the span of virus-ladden aerosols in a bidirectional way. Five pairs of triboseries fabrics i.e. nylon - polyester, cotton - polyester, poly(methyl methacrylate) - PVDF, lylon - PVDF and polypropylene - polyester have been optimized in this study in terms of their effective tribo-electric charge densities as 83.13, 211.48, 38.62, 69 and 74.25 nC/m2, respectively. This smart mask can be used by a wide range of people because of its simple mechanism, self-driven (harvesting mechanical energy from daily activities, e.g. breathing, talking, or other facial movements functionalities, and effective filtration efficiency and thus, it is expected to be potentially beneficial to slow down the devastating impact of COVID-19.

    Comment: No comments
    Keywords Physics - Medical Physics ; covid19
    Publishing date 2020-05-17
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Heat stress response mechanisms in pollen development.

    Chaturvedi, Palak / Wiese, Anna J / Ghatak, Arindam / Záveská Drábková, Lenka / Weckwerth, Wolfram / Honys, David

    The New phytologist

    2021  Volume 231, Issue 2, Page(s) 571–585

    Abstract: ... strategies for high and stable production in crop plants. While most studies have focused on the vegetative ...

    Abstract Being rooted in place, plants are faced with the challenge of responding to unfavourable local conditions. One such condition, heat stress, contributes massively to crop losses globally. Heatwaves are predicted to increase, and it is of vital importance to generate crops that are tolerant to not only heat stress but also to several other abiotic stresses (e.g. drought stress, salinity stress) to ensure that global food security is protected. A better understanding of the molecular mechanisms that underlie the temperature stress response in pollen will be a significant step towards developing effective breeding strategies for high and stable production in crop plants. While most studies have focused on the vegetative phase of plant growth to understand heat stress tolerance, it is the reproductive phase that requires more attention as it is more sensitive to elevated temperatures. Every phase of reproductive development is affected by environmental challenges, including pollen and ovule development, pollen tube growth, male-female cross-talk, fertilization, and embryo development. In this review we summarize how pollen is affected by heat stress and the molecular mechanisms employed during the stress period, as revealed by classical and -omics experiments.
    MeSH term(s) Heat-Shock Response ; Plant Breeding ; Pollen ; Stress, Physiological ; Thermotolerance
    Language English
    Publishing date 2021-05-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.17380
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