Mechanochemical engineering of 2D materials for multiscale biointerfaces

Machnicki, C.E.; Fu, Fanfan; Jing, Lin; Chen, Po‐Yen; Wong, Ian Y.

doi:10.1039/c9tb01006h

Cited by 19 publications

(17 citation statements)

References 124 publications

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“…Then, the roots of 𝐴(𝑘) = 0 for nontrivial 𝑤 ̂(𝑘) provide the bifurcation wavenumbers. 5 Fourier transform is defined as , which are in agreement with classical (i.e. without flexoelectricity) results on wrinkling [5,6].…”

Section: Methodology: Theoretical Formulationsupporting

confidence: 75%

“…5 Fourier transform is defined as , which are in agreement with classical (i.e. without flexoelectricity) results on wrinkling [5,6]. A more general critical wavenumber of an N-layer film with vanishing flexoelectricity on a neo-Hookean substrate is derived from [9] as…”

Section: Methodology: Theoretical Formulationsupporting

confidence: 64%

“…Under the assumption of small displacements, the Euler-Lagrange equation is then obtained and its Fourier-transformed 5 form becomes,…”

Section: Methodology: Theoretical Formulationmentioning

confidence: 99%

“…The origin of this coupling, as the name suggests, lies in the distortion of electron cloud upon bending of the layer, which makes flexoelectricity a universal A c c e p t e d m a n u s c r i p t phenomenon that can occur in all dielectric materials. In particular, quantum flexoelectricity in graphene has attracted a lot of attention due to the already impressive range of properties of graphene that hold immense promise for high-end technologies [5,6].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Flexoelectricity-driven periodic buckling in multilayer graphene bonded to compliant substrate

Kothari

Kim

2022

MRS Communications

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Section: Methodology: Theoretical Formulationsupporting

confidence: 75%

Section: Methodology: Theoretical Formulationsupporting

confidence: 64%

“…Under the assumption of small displacements, the Euler-Lagrange equation is then obtained and its Fourier-transformed 5 form becomes,…”

Section: Methodology: Theoretical Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flexoelectricity-driven periodic buckling in multilayer graphene bonded to compliant substrate

Kothari

Kim

2022

MRS Communications

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show abstract

“…For an ideal flexible pressure sensor, it must not only fit the biological body, but also can maintain good sensing performance and stability, reaching or even exceeding the level of mature traditional sensor devices. [ 16 ] Generally, this type of flexible pressure sensor can be achieved by two efforts, that is, the choice of new materials with outstanding electrical conductivity, [ 17–20 ] and the design of new structures for the material. [ 21–24 ]…”

Section: Introductionmentioning

confidence: 99%

High‐Performance MXene‐Based Flexible and Wearable Pressure Sensor Based on a Micro‐Pyramid Structured Active Layer

Fang

Min

Qin

et al. 2022

Adv Materials Technologies

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conductivity, [17][18][19][20] and the design of new structures for the material. [21][22][23][24] MXene (Ti 3 C 2 T x ), an emerging 2D nanomaterial composed of transition metal carbide/nitride, has excellent electrical conductivity due to its inherent ease of building conductive networks and shows significant application potentials in the field of smart sensors in recent years. [25][26][27] For example, Kedambaimoole et al. used a laser cutting method to prepare MXene thin films for skin conformable tattoo sensors with high strain sensitivity, which corresponds to the sensing mechanism of nano-crack generation and propagation. [28] Besides, Pu et al. proposed a feasible strain sensor fabrication strategy based on strain localization-induced fracture mechanism to achieve highly sensitive signal output at small strain by the change of fracture crack inside the material under stress. [29] In general, MXene-based flexible electronic devices are often unable to maintain good signal output stability while simultaneously realizing high sensitivity and wide detection range. Rational macrostructure design of MXene film has been proved to be an effective method to realize the above goal. Unfortunately, regardless of many structures being applied to construct MXene-based flexible sensitive sensors in the past years, defects in the structure itself may also lead to a short working lifetime and unstable signal output. Accordingly, in consideration of the demands in practical applications, suitable surface structure design to construct high-performance MXene-based flexible sensitive sensors is of great importance.In view of the above content, we in the present work develop a simple and low-cost substrate shrinkage method to prepare flexible pyramid-like MXene film (PMF) and further assemble it into high-quality flexible and wearable pressure sensor (PMFS). Delightedly, the unique micro-pyramidal microstructure endows the sensor with high sensitivity (64.56 kPa −1 ) and wide sensing range (4.9 Pa-98 kPa). More importantly, benefiting from the good stability characteristics of the angular cone structure, [30][31][32] the prepared pressure sensor could output stable signal output and exhibit long-time service life (18 000 cycles). Based on the remarkable sensing characteristics, the resulting pressure sensor was further applied to real-time detection of human physiological signals and recognition of facial subtle expressions, demonstrating its broad application prospect in future flexible intelligent wearable electronic devices.

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Stretchable, Nano‐Crumpled MXene Multilayers Impart Long‐Term Antibacterial Surface Properties

Tokmedash

Nagpal

Chen

et al. 2023

Adv Materials Inter

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Infections are a significant risk to patients who receive medical implants, and can often lead to implant failure, tissue necrosis, and even amputation. So far, although various surface modification approaches are proposed for prevention and treatment of microbial biofilms on indwelling medical devices, most are too expensive/complicated to fabricate, unscalable, or limited in durability for clinical use. Here, this work presents a new bottom-up design for fabricating scalable and durable nano-patterned coatings with dynamic topography for long-term antibacterial effects. This work shows that MXene layer-by-layer (LbL) self-assembled coatings-with finely tunable crumpled structures with nanometer resolution and excellent mechanical durabilitycan be successfully fabricated on stretchable poly(dimethylsiloxane) (PDMS). The crumpled MXene coating with sharp-edged peaks shows potent antibacterial effects against Staphylococcus aureus and Escherichia coli. In addition, this work finds that on-demand dynamic deformation of the crumpled coating can remove ≥99% of adhered bacterial cells for both species, resulting in a clean surface with restored functionality. This approach offers improved practicality, scalability, and antibacterial durability over previous methods, and its flexibility may lend itself to many types of biomaterials and implantable devices.

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Mechanochemical engineering of 2D materials for multiscale biointerfaces

Abstract: Atomically thin nanomaterials that are wrinkled or crumpled represent a unique paradigm for interfacing with biological systems due to their mechanical flexibility, exceptional interfacial area, and ease of chemical functionalization.

Cited by 19 publications

References 124 publications

Flexoelectricity-driven periodic buckling in multilayer graphene bonded to compliant substrate

Flexoelectricity-driven periodic buckling in multilayer graphene bonded to compliant substrate

High‐Performance MXene‐Based Flexible and Wearable Pressure Sensor Based on a Micro‐Pyramid Structured Active Layer

Stretchable, Nano‐Crumpled MXene Multilayers Impart Long‐Term Antibacterial Surface Properties

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