MXene-PEDOT:PSS Nanocomposite-Based Electromagnetic Interference Shields with Ultrahigh Absolute Shielding Effectiveness

High green index electromagnetic interference shields with semiconducting Bi2S3 fillers in a PEDOT:PSS matrix

“…Interestingly, this layered compact structure plays a significant role in EMI shielding by providing various interfaces for internal scattering. 16 The cross-sectional EDS mapping of the BSPP-10 nanocomposite film reveals the homogenous presence of Bi, S, C, and O elements over the whole cross section, confirming the co-existence of both Bi 2 S 3 nanorods and PEDOT:PSS polymers in the nanocomposites as illustrated in Fig. 1(f)–(j).…”

“…27 The absence of a shoulder at approximately 1442 cm −1 , arising from symmetric stretching mode vibrations of the benzoid CαCβ components, suggests a prevalence of quinoid structure. 16 The peak at 1567 cm −1 is associated to the asymmetric stretching vibration of CαCβ bonds in the thiophene ring at the termination of PEDOT chain. The peaks located at 1367 and 1256 cm −1 represent the stretching deformations Cβ–Cβ and stretching vibrations of Cα–Cα bonds in PEDOT, respectively.…”

“…With electronic components getting increasingly smaller, the weight penalty becomes a serious concern with conventional metal shields. Successful alternatives in the literature have included shields based on graphene, 10–12 carbon nanotubes, 13 MXenes 14–16 and other 2D materials. 2,3,17 All these new materials have been shown to mitigate the shortcomings of metals while providing good shielding effectiveness.…”

“…For example, printed graphene has been shown to yield a GI value of 0.14 11 while printed MXene–polymer composite exhibits GI in the range of 0.2–0.6. 16 Note that SE A may be greater than SE R for shields based on these materials but reflection and absorption losses do not represent actual reflected and absorbed power levels and thus, cannot be used to assess the relative contributions of reflection and absorption; further discussion on this with numerical examples is given under ESI †. The green index based on A and R is the true measure of the relative contributions of absorption and reflection to the observed shielding performance of any material.…”

Printed graphene and its composite with copper for electromagnetic interference shielding applications

“…Conducting polymers require high loading of fillers to obtain the desired shielding effectiveness (SE) resulting in very thick (mm scale) films and they lack scalability. The above inadequacies to meet the modern EMI shielding needs have led to the exploration of carbon based nanomaterials [8][9][10][11] and a wide variety of 2D materials [12][13][14][15][16] for their effectiveness in EMI shielding. Among the candidates, graphene and its composites with other conducting and magnetic materials have been shown to be highly effective with SE in the range of 20-70 dB [10,[17][18][19][20][21][22][23][24][25].…”