Hybrid materials of pyrene substituted phthalocyanines with single-walled carbon nanotubes: structure and sensing properties

Abstract

Hybrid materials of single walled carbon nanotubes (SWCNT) were obtained by their non-covalent functionalization with asymmetrically polyoxyethylene substituted metal-free, copper(ii) and cobalt(ii) phthalocyanines bearing one pyrene group as a substituent.

Effect of covalent and non-covalent linking of zinc(II) phthalocyanine functionalised carbon nanomaterials on the sensor response to ammonia

“…The amount of ZnPc molecules covalently bonded to SWCNT is 1.8 times higher than that of ZnPc molecules non-covalently bonded to SWCNT. The correlation between the amount of adsorbed pyrene-substituted phthalocyanine molecules (MPcpy, M=Cu, Co, 2H) in SWCNT-based hybrids and their sensor responses have already been described in the literature [41]. Both SWCNT-based hybrids exhibit higher response toward NH 3…”

“…It was shown that the interaction of asymmetric zinc(II) phthalocyanine containing 5 one pyrene substituent with SWCNTs is more favorable than in the case of symmetric without pyrene counterpart that provided a higher sensor response toward ammonia vapor. The influence of central metal in the phthalocyanine molecule on sensor response was also verified [41,42].…”

“…In our previous works [39][40][41], we have directed our research to study the influence of phthalocyanines containing different central metals, symmetric or asymmetric substitution, and type of substitutes on the structural and sensor properties of SWCNT/MPc hybrids. We compared [40] the structural features and sensor properties of SWCNT hybrids with symmetrically octa-polyoxyethylene substituted zinc(II) phthalocyanine and its asymmetrically substituted derivative containing three polyoxyethylene groups and one pyrene group as substituents.…”

Carbon Nanotube Based Gas Sensors toward Breath Analysis

“…These macrocycles have been appended to CNTs to overcome their inherently low conductivity and surface‐to‐volume ratio; thus allowing them to be used in a chemiresistor approach for sensing. In particular, coordinated phthalocyanines attached to CNTs have been applied toward sensing reducing gases, such as NH 3 and H 2 S . Liang et al.…”

“…These macrocycles have been appended to CNTst oo vercome their inherently low conductivity and surface-to-volume ratio;t hus allowing them to be used in a chemiresistor approach for sensing. In particular,c oordinated phthalocyanines attachedt oC NTsh ave been appliedt oward sensing reducingg ases, such as NH 3 [91,94] and H 2 S. [95] Liang et al prepared different metal(II) phthalocyanine (MPc)/ MWCNT hybridst hrough p-p stacking, and studied the effect of the metal center on the sensitivity of MPc/MWCNTst oward NH 3 . [91] The sensitivity of MPc/MWCNTst owardN H 3 decreased in the order of Co > Zn > Cu > Pb > Pd % Ni (Figure 10).…”