Enhancing the Interaction of Carbon Nanotubes by Metal-Organic Decomposition with Improved Mechanical Strength and Ultra-Broadband EMI Shielding Performance

The remarkable properties of carbon nanotubes(CNTs)have led to promising applications in the field of electromagnetic inter-ference(EMI)shielding.However,for macroscopic CNT assemblies,such as CNT film,achieving high electrical and mechanical properties remains challenging,which heavily depends on the tube-tube interac-tions of CNTs.Herein,we develop a novel strategy based on metal-organic decomposition(MOD)to fabricate a flexible silver-carbon nanotube(Ag-CNT)film.The Ag particles are introduced in situ into the CNT film through annealing of MOD,leading to enhanced tube-tube interactions.As a result,the electrical conductivity of Ag-CNT film is up to 6.82×10^(5) S m^(-1),and the EMI shielding effectiveness of Ag-CNT film with a thickness of~7.8μm exceeds 66 dB in the ultra-broad frequency range(3-40 GHz).The tensile strength and Young’s modulus of Ag-CNT film increase from 30.09±3.14 to 76.06±6.20 MPa(~253%)and from 1.12±0.33 to 8.90±0.97 GPa(~795%),respectively.Moreover,the Ag-CNT film exhibits excellent near-field shield-ing performance,which can effectively block wireless transmission.This innovative approach provides an effective route to further apply macroscopic CNT assemblies to future portable and wearable electronic devices.

Delayed diagnosis of prosopagnosia following a hemorrhagic stroke in an elderly man:A case report

BACKGROUND Acquired prosopagnosia is a rare condition characterized by the loss of familiarity with previously known faces and the inability to recognize new ones.It usually occurs after the onset of brain lesions such as in a stroke.The initial identification of prosopagnosia generally relies on a patient’s self-report,which can be challenging if it lacks an associated chief complaint.There were few cases of prosopagnosia presenting purely as eye symptoms in the previous literature confirmed by functional magnetic resonance imaging(MRI).CASE SUMMARY We present a case of delayed diagnosis of prosopagnosia after a right hemisphere stroke in an elderly man whose chief complaint was persistent and progressive"blurred vision"without facial recognition impairment.Ophthalmic tests revealed a homonymous left upper quadrantanopia,with normal visual acuity.He was found by accident to barely recognize familiar faces.The patient showed severe deficit in face recognition and perception tests,and mild memory loss in neuropsychological assessments.Further functional MRI revealed the visual recognition deficits were face-specific.After behavioral intervention,the patient started to rely on other cues to compensate for poor facial recognition.His prosopagnosia showed no obvious improvement eight months after the stroke,which had negative impact on his social network.CONCLUSION Our case demonstrates that the presentation of prosopagnosia can be atypical,and visual difficulties might be a clinical manifestation solely of prosopagnosia,which emphasizes the importance of routinely considering face recognition impairment among elderly patients with brain lesions.