Enhanced nonlinear optical absorption in defect enriched graphene oxide and reduced graphene oxide using continuous wave laser z-scan technique

Kumara, Karthik; Kindalkar, Veena Shivadas; Serrao, Felcy Jyothi; Shetty, T. Chandra Shekhara; Patil, P. S.; Dharmaprakash, S. M.

doi:10.1016/j.matpr.2022.02.028

Cited by 8 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…rGO is synthesized via chemical, thermal, or electrochemical reduction of GO. In general, the most utilized reducing agents for reducing GO to rGO are hydrazine hydrate, hydrazine, sodium borohydride, and l -ascorbic acid . During reduction, the oxygen functional groups present on the GO are removed up to a certain extent (Figure e), and the percentage of sp 2 carbon atoms increases, which increases its conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…In general, the most utilized reducing agents for reducing GO to rGO are hydrazine hydrate, hydrazine, sodium borohydride, and Lascorbic acid. 18 During reduction, the oxygen functional groups present on the GO are removed up to a certain extent (Figure 1e), and the percentage of sp 2 carbon atoms increases, which increases its conductivity. rGO possesses the same properties as graphene but is faster and economical to produce and manipulate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Graphene-Based Inks for Flexible Supercapacitor Electrodes: A Review

Nargatti,

Pathak,

Ahankari

et al. 2023

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

In the world of consumer electronics, flexible and wearable electronic devices have witnessed a remarkable transformation, and flexible supercapacitors (SCs) hold tremendous potential as a power source for these electronic devices. Printing technologies, such as inkjet and screen printing, have emerged as cost-effective and scalable manufacturing techniques for the fabrication of flexible SC electrodes. As a key element of printing technology, ink must have the right balance of conductivity and rheological properties to fabricate high-performance flexible electrodes. Graphene stands out as a promising active pigment for conductive ink due to its remarkable characteristics such as high surface area, excellent electrical conductivity, and mechanical properties. Recently, extensive research has been conducted on the development of graphene-based inks for their effective utilization in SC printing methods. This review summarizes these advances and systematically connects the graphene ink formulation with its rheological properties and correlates finally with the electrochemical performance of inkjet-and screen-printed SC electrodes.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graphene-Based Inks for Flexible Supercapacitor Electrodes: A Review

Nargatti,

Pathak,

Ahankari

et al. 2023

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

show abstract

“…However, it is worth noting that resonant excitation demands a longer duration within the nonlinear process compared to its non-resonant counterpart [30]. The literature review divulges that the few layers of GO dispersion and reduced GO (rGO) are good candidates for the optical power limiting at the 532 nm wavelength [31][32][33][34]. Also, GO nanosheets dispersed in DI water demonstrated the broadband NLO and its prospective application in optical power limiting at the 1064 nm wavelength [35].…”

Section: Introductionmentioning

confidence: 99%

Cubic Nonlinearity of Graphene-Oxide Monolayer

Neupane,

Poudyal,

Tabibi

et al. 2023

Materials

View full text Add to dashboard Cite

The cubic nonlinearity of a graphene-oxide monolayer was characterized through open and closed z−scan experiments, using a nano-second laser operating at a 10 Hz repetition rate and featuring a Gaussian spatial beam profile. The open z−scan revealed a reverse saturable absorption, indicating a positive nonlinear absorption coefficient, while the closed z−scan displayed valley-peak traces, indicative of positive nonlinear refraction. This observation suggests that, under the given excitation wavelength, a two-photon or two-step excitation process occurs due to the increased absorption in both the lower visible and upper UV wavelength regions. This finding implies that graphene oxide exhibits a higher excited-state absorption cross-section compared to its ground state. The resulting nonlinear absorption and nonlinear refraction coefficients were estimated to be approximately ~2.62 × 10−8 m/W and 3.9 × 10−15 m2/W, respectively. Additionally, this study sheds light on the interplay between nonlinear absorption and nonlinear refraction traces, providing valuable insights into the material’s optical properties.

show abstract