Emerging 2D Cobalt Telluride (Co_xTe_y): from Theory to Applications

Abstract

Cobalt telluride, with tunable magnetism and ferromagnetism that hinged upon the stoichiometric ratio, has emerged as a new member of 2D materials in the last decade. Metallic doping by sodium (Na) and platinum (Pt) atoms below critical concentrations is found to enhance the magnetism of cobalt telluride. After thinning cobalt telluride down to few‐layer, the saturation magnetism is improved by two order of magnitudes because of the oxidation state of cobalt (Co) and reduced coordination number of the surface atoms. In 2D limit, cobalt di‐telluride possesses Dirac band structure with many nodal lines that correlate with quantum criticality and other fantastic physics. In this mini‐review, the crystal and band structures of cobalt telluride categorized by stoichiometric ratio are overviewed after briefing the introduction. Both top‐down and bottom‐up methods are then discussed to offer optimum solutions for each specified application scenario. Afterward, emerging magnetic and electronic properties and credit enhancements are launched accompanied with their key advances. Beyond these, the faced challenges and possible directions of future research are also provided, attempting to boost both fundamental physics and device applications based on 2D cobalt telluride.

Subpicomolar Dopamine Detection Using Two-Dimensional Cobalt Telluride

“…14 In this study, we are using 1:2 (Co:Te) stoichiometric variant, i.e., 2D CoTe 2 for electrochemical sensing due to its exceptional semimetallic behavior. 8 Moreover, cobalt (Co), as a well-known transition metal, exhibits various oxidation states, including Co 2+ , Co 3+ , and Co 4+ and possesses a prominent reduction potential. 4 Apart from that, it possesses abundant active sites facilitating ion migration within two-dimensional systems, which makes 2D CoTe 2 a potential candidate for electrochemical sensing.…”

“…6,7 Analogous to these, we have utilized here a new member of the TMT family, 2D CoTe 2 for electrochemical sensing. Few researchers have explored 2D cobalt telluride with different stoichiometry 8 (2D Co x Te y ) for energy generation, 9,10 photocatalytic activity, 11 exploration of thickness-dependent electronic property, 12 tribological and magnetic behavior, 13 and sensing. 14 In this study, we are using 1:2 (Co:Te) stoichiometric variant, i.e., 2D CoTe 2 for electrochemical sensing due to its exceptional semimetallic behavior.…”

“…These atomically thin structures, with notable properties of high electron mobility, abundance of surface charge densities, excellent light–matter interactions, higher environmental stability, tunable electrical conductivity, and large surface area that ensures maximum exposure to target analytes, offer unprecedented opportunities for developing high-performance sensing platforms. , Recently, a few groups of researchers have successfully developed plasmon-free Raman-scattering-based sensors exploring the excellent properties of 2D TMTs. , Analogous to these, we have utilized here a new member of the TMT family, 2D CoTe 2 for electrochemical sensing. Few researchers have explored 2D cobalt telluride with different stoichiometry (2D Co x Te y ) for energy generation, , photocatalytic activity, exploration of thickness-dependent electronic property, tribological and magnetic behavior, and sensing . In this study, we are using 1:2 (Co:Te) stoichiometric variant, i.e., 2D CoTe 2 for electrochemical sensing due to its exceptional semimetallic behavior .…”

“…Few researchers have explored 2D cobalt telluride with different stoichiometry (2D Co x Te y ) for energy generation, , photocatalytic activity, exploration of thickness-dependent electronic property, tribological and magnetic behavior, and sensing . In this study, we are using 1:2 (Co:Te) stoichiometric variant, i.e., 2D CoTe 2 for electrochemical sensing due to its exceptional semimetallic behavior . Moreover, cobalt (Co), as a well-known transition metal, exhibits various oxidation states, including Co 2+ , Co 3+ , and Co 4+ and possesses a prominent reduction potential .…”