skip to main content


Title: Ti 2 CT x MXene‐based all‐optical modulator
Abstract

MXenes, a new class of 2D transition metal carbides, nitrides, and carbonitrides, have attracted much attention due to their outstanding properties. Here, we report the broadband spatial self‐phase modulation of Ti2CTxMXene nanosheets dispersed in deionized water in the visible to near‐infrared regime, highlighting the broadband nonlinear optical (NLO) response of Ti2CTxMXene. Using ultrafast pulsed laser excitation, the nonlinear refractive indexn2and the third‐order nonlinear susceptibilityof Ti2CTxMXene were measured to be ∼10−13m2/W and ∼ 10−10esu, respectively. Leveraging the large optical nonlinearity of Ti2CTxMXene, an all‐optical modulator in the visible regime was fabricated based on the spatial cross‐phase modulation effect. This work suggests that 2D MXenes are ideal broadband NLO materials with excellent prospects in NLO applications.

image

 
more » « less
Award ID(s):
1930881
NSF-PAR ID:
10458534
Author(s) / Creator(s):
 ;  ;  ;  ;  ;  ;  ;  ;  
Publisher / Repository:
Wiley Blackwell (John Wiley & Sons)
Date Published:
Journal Name:
InfoMat
Volume:
2
Issue:
3
ISSN:
2567-3165
Page Range / eLocation ID:
p. 601-609
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
More Like this
  1. Abstract

    Diverse alkenylboronic acids react smoothly with varioussp3‐carbon electrophiles such as unactivated alkyl triflates in the presence of mild bases such as K3PO4. The reaction protocol is very mild and thereby enables high functional group tolerance. This transition metal‐free condition is orthogonal towards the classic transition metal catalyzed Suzuki coupling.

    magnified image

     
    more » « less
  2. Abstract

    A new organocatalyst, the selenolate anion [RSe], generated from bench‐stable and commercially available diphenyl diselenide or from phenyl benzyl selenide (10 mol%) is introduced. Benchmarking is performed in the conversion of benzylic chlorides intotrans‐stilbenes selectively at room temperature. Mechanistic studies support the intermediacy of the selenolate anion and of 1,2‐diphenylethyl phenyl selenide.

    magnified image

     
    more » « less
  3. Abstract

    A Rh(II)/Au(I) catalyzed carbene cascade approach for the stereoselective synthesis of diverse spirocarbocycles is described. The cascade reaction involves a rhodium carbene initiatedsp2C−H functionalization followed by a gold catalyzed Conia‐ene cyclization. The cascade reaction accommodates a variety of aryl substituents as well as ring sizes and proceeds with high diastereoselectivity providing access to diverse spirocarbocycles.

    magnified image

     
    more » « less
  4. Abstract

    We report the synthesis of α‐trifluoromethylacrylates from α‐trifluoroborylacrylatesviaa stereoretentive radical trifluoromethylation with inexpensive reagents NaSO2CF3and TBHP at room temperature. Under these conditions, a wide substrate scope afforded the (E)‐diastereomer exclusively in moderate to good yield. The utility of the reaction products is demonstrated in the synthesis of phenyl‐4H‐pyran, a potent and selective class of IKCa channel blockers.

    magnified image

     
    more » « less
  5. Abstract

    With sunlight or blue LEDs irradiation, regioselective decarboxylative alkylation of various non‐aromatic heterocycles has been realized via C(sp3)‐centered radical C(sp2)−C(sp3) bond formation under oxidant‐free conditions at room temperature. This reaction readily incorporates various functional alkyl groups into heterocyclic compounds without observation of any alkyl radical rearrangement and represents a mild and general tool for the preparation of valuable alkyl group‐functionalized heterocyclic compounds.

    magnified image

     
    more » « less