The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy
<p dir="ltr">This study examines the effects of the structural integrity of graphene on the thermoelectric properties of n-type bismuth telluride alloy. Graphene/Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> composites were prepared via mechanical...
محفوظ في:
| المؤلف الرئيسي: | |
|---|---|
| مؤلفون آخرون: | , |
| منشور في: |
2021
|
| الموضوعات: | |
| الوسوم: |
إضافة وسم
لا توجد وسوم, كن أول من يضع وسما على هذه التسجيلة!
|
| _version_ | 1864513545429843968 |
|---|---|
| author | Farah M. El-Makaty (14157090) |
| author2 | K. Andre Mkhoyan (17302786) Khaled M. Youssef (14157099) |
| author2_role | author author |
| author_facet | Farah M. El-Makaty (14157090) K. Andre Mkhoyan (17302786) Khaled M. Youssef (14157099) |
| author_role | author |
| dc.creator.none.fl_str_mv | Farah M. El-Makaty (14157090) K. Andre Mkhoyan (17302786) Khaled M. Youssef (14157099) |
| dc.date.none.fl_str_mv | 2021-09-25T00:00:00Z |
| dc.identifier.none.fl_str_mv | 10.1016/j.jallcom.2021.160198 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/The_effects_of_structural_integrity_of_graphene_on_the_thermoelectric_properties_of_the_n-type_bismuth-telluride_alloy/24459106 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Engineering Chemical engineering Materials engineering Nanotechnology Thermoelectric materials Mechanical alloying Bismuth telluride Graphene |
| dc.title.none.fl_str_mv | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p dir="ltr">This study examines the effects of the structural integrity of graphene on the thermoelectric properties of n-type bismuth telluride alloy. Graphene/Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> composites were prepared via mechanical alloying and spark plasma sintering techniques. Different graphene concentrations (0.05 and 0.5 wt%) and addition times (20 hrs, 10 mins, and 1 min) were considered. The thermoelectric properties were measured, and the results showed that the milling time affects graphene structure as well as its agglomeration. It is revealed that the optimum time to add the two-dimensional filler is during the last phase of mechanical milling as it will preserve graphene’s structure and boost the electrical conductivity. It is also shown that as the milling time of graphene increases, the Seebeck coefficient improves. Even though an increase in the thermal conductivity is expected due to the high electrical conductivity, a clear reduction in the lattice thermal conductivity part was obtained due to the increased scattering at the new interfaces. The figure-of-merit for the optimum sample with 0.05 wt% graphene added in the last 10 mins of milling had an improvement of 19% at room temperature reaching a value of 0.5, and 25% at 160 °C achieving a final value of 0.81.</p><h2>Other Information</h2><p dir="ltr">Published in: Journal of Alloys and Compounds<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.jallcom.2021.160198" target="_blank">https://dx.doi.org/10.1016/j.jallcom.2021.160198</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_82f738ec27e645c54a2c12f7d6a15552 |
| identifier_str_mv | 10.1016/j.jallcom.2021.160198 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/24459106 |
| publishDate | 2021 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloyFarah M. El-Makaty (14157090)K. Andre Mkhoyan (17302786)Khaled M. Youssef (14157099)EngineeringChemical engineeringMaterials engineeringNanotechnologyThermoelectric materialsMechanical alloyingBismuth tellurideGraphene<p dir="ltr">This study examines the effects of the structural integrity of graphene on the thermoelectric properties of n-type bismuth telluride alloy. Graphene/Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> composites were prepared via mechanical alloying and spark plasma sintering techniques. Different graphene concentrations (0.05 and 0.5 wt%) and addition times (20 hrs, 10 mins, and 1 min) were considered. The thermoelectric properties were measured, and the results showed that the milling time affects graphene structure as well as its agglomeration. It is revealed that the optimum time to add the two-dimensional filler is during the last phase of mechanical milling as it will preserve graphene’s structure and boost the electrical conductivity. It is also shown that as the milling time of graphene increases, the Seebeck coefficient improves. Even though an increase in the thermal conductivity is expected due to the high electrical conductivity, a clear reduction in the lattice thermal conductivity part was obtained due to the increased scattering at the new interfaces. The figure-of-merit for the optimum sample with 0.05 wt% graphene added in the last 10 mins of milling had an improvement of 19% at room temperature reaching a value of 0.5, and 25% at 160 °C achieving a final value of 0.81.</p><h2>Other Information</h2><p dir="ltr">Published in: Journal of Alloys and Compounds<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.jallcom.2021.160198" target="_blank">https://dx.doi.org/10.1016/j.jallcom.2021.160198</a></p>2021-09-25T00:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.1016/j.jallcom.2021.160198https://figshare.com/articles/journal_contribution/The_effects_of_structural_integrity_of_graphene_on_the_thermoelectric_properties_of_the_n-type_bismuth-telluride_alloy/24459106CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/244591062021-09-25T00:00:00Z |
| spellingShingle | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy Farah M. El-Makaty (14157090) Engineering Chemical engineering Materials engineering Nanotechnology Thermoelectric materials Mechanical alloying Bismuth telluride Graphene |
| status_str | publishedVersion |
| title | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy |
| title_full | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy |
| title_fullStr | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy |
| title_full_unstemmed | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy |
| title_short | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy |
| title_sort | The effects of structural integrity of graphene on the thermoelectric properties of the n-type bismuth-telluride alloy |
| topic | Engineering Chemical engineering Materials engineering Nanotechnology Thermoelectric materials Mechanical alloying Bismuth telluride Graphene |